How to Choose Supplements: Evidence, Safety & What to Look For

Written by the NutriClaw Editorial Team | Last updated: September 2026

Choosing a supplement should start with the reason you are considering it, not with the claims printed on the front of the bottle. A useful supplement should address a specific nutritional, performance or practical need, contain ingredients supported by relevant evidence, disclose enough information to evaluate the dose, and have a safety profile appropriate for the person using it.

Price, packaging, phrases such as “natural,” “premium,” “clinically studied,” “high potency” or “third-party tested,” and even the presence of a researched ingredient do not by themselves establish that a finished supplement is effective.

This guide explains how to choose high-quality supplements, how to read a Supplement Facts label, what proprietary blends mean, how to evaluate clinical evidence, what third-party testing and certification actually tell you, how FDA regulates dietary supplements, how to identify supplement marketing red flags, and how to compare two products fairly.

What Are Dietary Supplements?

Dietary supplements include products such as vitamins, minerals, amino acids, proteins, botanicals and other dietary ingredients intended to supplement the diet.

They can be sold in forms including capsules, tablets, powders, liquids and gummies. They are not intended to replace conventional food or an otherwise adequate diet.

FDA regulates dietary supplements under a different framework from prescription and over-the-counter drugs.

For current regulatory information, see the FDA Questions and Answers on Dietary Supplements .

Do You Actually Need Supplements?

Not everyone needs the same supplements, and not every person needs supplements for the same reason.

Food remains the foundation of nutrition because foods provide combinations of protein, carbohydrate, fat, fiber, vitamins, minerals and other compounds that a single supplement usually does not reproduce.

Supplements can still be useful when they serve a clear purpose. Examples can include:

• helping correct or prevent an identified nutrient inadequacy
• helping meet nutrient needs when diet is restricted or limited
• providing a convenient source of dietary protein
• supplying a sports-nutrition ingredient with relevant evidence
• addressing a need identified with an appropriate healthcare professional

The useful question is therefore not:

“What supplements should everyone take?”

It is:

“What problem am I trying to solve, and is there evidence that this specific supplement helps solve it?”

Food vs Supplements: Which Is Better?

Food and supplements serve different roles.

Whole foods can provide energy, protein, fiber and many nutrients together. Supplements provide concentrated amounts of selected ingredients and can sometimes make meeting a specific nutritional or performance target more convenient.

A protein powder, for example, can make reaching a protein target easier, but it does not replace the broader nutritional value of a complete diet.

A vitamin supplement may help address a nutrient gap, but taking increasingly larger amounts after requirements are met does not automatically produce better health.

In most situations, it makes more sense to use supplements to supplement a sound diet rather than attempt to build the diet around supplements.

Step 1: Define Why You Are Considering a Supplement

Before comparing brands, identify the outcome.

Examples include:

• meeting daily protein needs
• supporting resistance-training performance
• addressing a specific vitamin or mineral intake
• comparing pre-workout ingredients
• understanding a botanical supplement
• evaluating a weight-management ingredient

This prevents a common mistake: buying a product simply because its front label lists several desirable outcomes.

A supplement designed for one purpose should not automatically be expected to solve unrelated problems.

Step 2: Research the Ingredient, Not Just the Product Claim

The quality of the evidence matters more than the number of scientific-sounding words on a label.

When researching a supplement ingredient, ask:

• Has it been studied in humans?
• Was the study randomized and controlled?
• Has more than one research group reproduced the result?
• Are systematic reviews or meta-analyses available?
• Was the research conducted in people similar to the intended user?
• What outcome was actually measured?
• How large was the effect?
• How long was the intervention?
• What dose and ingredient form were used?
• Were adverse effects reported?

Mechanistic evidence can explain why an ingredient might work, but a plausible mechanism is not the same as demonstrating a meaningful result in humans.

Ingredient Evidence vs Finished-Product Evidence

Evidence that an ingredient works does not automatically prove that every finished product containing that ingredient works equally well.

Suppose a clinical trial studies a specific ingredient form at a particular dose for twelve weeks in resistance-trained adults.

A different product may:

• contain a smaller amount
• use a different chemical form
• combine it with several other ingredients
• target a different population
• recommend a different usage pattern

It is therefore useful to distinguish:

“This ingredient has research supporting this outcome”

from:

“This exact finished formula has been shown to produce this outcome.”

Those are not equivalent claims.

Step 3: Check Whether the Dose Matches the Evidence

Even a well-researched ingredient can be difficult to evaluate if the label does not disclose how much is present.

When human trials use a particular amount, the useful comparison is between that research dose and the amount provided by the product—not simply whether the ingredient appears somewhere in the formula.

At the same time, dose comparisons require context. More is not automatically better.

The appropriate amount can depend on:

• the ingredient
• the chemical form
• body size
• dietary intake
• health status
• the outcome being studied
• the duration of use

A product does not become superior simply because it contains the largest number printed on the label.

How to Read a Supplement Facts Label

The Supplement Facts panel is one of the most useful places to begin when evaluating a dietary supplement.

FDA requires dietary supplement labeling to provide information including serving size and declared dietary ingredients, subject to specific labeling rules.

See: FDA dietary supplement labeling requirements .

Read the label in this order:

1. Serving size
2. Amount per serving
3. Ingredient name and form
4. % Daily Value, where applicable
5. Proprietary blend information
6. Other ingredients
7. Directions and warnings
8. Manufacturer or distributor information

1. Serving Size

The serving size tells you how many capsules, scoops, gummies, tablets or other units correspond to the amounts listed in the Supplement Facts panel.

A common comparison error is assuming that two products provide the same amount per capsule when one label actually defines a serving as two, three or four capsules.

2. Amount Per Serving

Check the quantity provided per full serving rather than relying on large numbers printed on the front of the package.

Then compare that amount with the dose used in relevant human research where such research exists.

3. Ingredient Form

The exact form can matter for some nutrients and supplements.

Different forms can vary in characteristics such as absorption, gastrointestinal tolerance, stability or the amount of the active nutrient actually delivered.

But “better absorbed” should not automatically be translated into “produces better clinical outcomes.”

4. Other Ingredients

Supplement labels can also contain ingredients used for manufacturing, flavor, texture, preservation, capsules, sweetening or coloring.

These ingredients are separate from the dietary ingredients declared in Supplement Facts.

Reading this section can be particularly useful for people avoiding specific allergens or unnecessary additives.

What Does % Daily Value Mean on a Supplement?

Percent Daily Value (%DV) shows how much one serving contributes to the established Daily Value for that nutrient.

FDA defines Daily Values as reference amounts used on Nutrition Facts and Supplement Facts labels.

For example, a product containing 50% DV of a nutrient provides half of the Daily Value in one labeled serving.

Read more from: FDA — Daily Value on Nutrition and Supplement Facts Labels .

%DV should not be interpreted as a score showing how effective a product is. A higher percentage is not automatically superior.

What Does “Daily Value Not Established” Mean?

Some dietary ingredients do not have an FDA-established Daily Value.

In those cases, labels may indicate that a Daily Value has not been established.

This does not by itself mean that the ingredient is unsafe, ineffective or unresearched.

It simply means there is no established Daily Value being used for the label. Evidence for the ingredient still needs to be assessed separately.

What Is a Proprietary Blend?

A proprietary blend is a group of dietary ingredients listed together under a blend name.

Under FDA labeling rules, the label generally declares the total weight of the proprietary blend while individual ingredients within that blend are listed in descending order by weight rather than necessarily showing the exact quantity of every individual ingredient.

FDA explains the rule in its: Dietary Supplement Labeling Guide .

Are Proprietary Blends Bad?

Not automatically, but they reduce dose transparency.

The main problem is practical. If a blend contains five ingredients but discloses only their combined weight, it may be impossible to determine how much of each ingredient is present.

That makes it harder to:

• compare the product with doses used in clinical trials
• compare two competing products
• calculate total intake across several supplements
• identify whether a key ingredient is present in a meaningful quantity

When two otherwise similar products exist, a fully disclosed formula usually gives the consumer more information to make an evidence-based comparison.

What Does “Clinically Studied” Mean on a Supplement?

“Clinically studied” can refer to very different things.

It may mean:

• one ingredient has been studied
• a trademarked ingredient has been studied
• a similar formulation has been studied
• the exact finished product has been studied

Those are not interchangeable.

Ask:

• What exactly was studied?
• Was it the finished product?
• Was the same dose used?
• Was the same ingredient form used?
• Was there a placebo or control group?
• Was the research published?
• Has the result been replicated?

Clinically Studied vs Clinically Proven

A study existing does not mean that a claim has been conclusively proven.

One small trial may produce an interesting result. Confidence becomes stronger when findings are repeated in multiple well-designed studies and supported by systematic reviews or meta-analyses.

Strong supplement evaluation therefore considers the totality of evidence, not simply whether a manufacturer can link to one favorable study.

What Does Third-Party Tested Mean?

Third-party testing means some form of testing has been performed by an organization separate from the product manufacturer.

However, the phrase by itself does not tell you:

• which laboratory performed the test
• what substances were tested
• whether ingredient identity was verified
• whether potency was checked
• whether contaminants were tested
• whether every batch or only one sample was tested
• what pass/fail criteria were used

Therefore, “third-party tested” is more informative when the company identifies the testing organization, scope, certification standard or relevant batch documentation.

Third-Party Tested vs Third-Party Certified

Testing and certification are related but not necessarily the same thing.

A product may be sent to an independent laboratory for a particular analysis. Certification programs typically apply defined standards and verification procedures before allowing qualifying products to display a certification mark.

A certification mark therefore provides information about a specific program, whereas the general phrase “third-party tested” may provide little information unless further details are available.

What Does NSF Certified for Sport Mean?

NSF's Certified for Sport program is particularly relevant to competitive athletes.

According to NSF, the program includes independent certification designed to help verify that qualifying sports supplements do not contain substances banned by major sporting organizations within the scope of the certification program.

Learn more: NSF Certified for Sport Program .

Certification still does not mean the product is guaranteed to deliver every advertised performance outcome.

What Does USP Verified Mean?

USP operates an independent dietary supplement verification program.

According to USP, its program includes manufacturing-facility auditing, review of quality-control documentation, laboratory testing and continued off-the-shelf testing for participating verified supplements.

More information: USP Dietary Supplement Verification Program .

Again, quality verification and clinical effectiveness are different questions.

What Is a Certificate of Analysis (COA)?

A Certificate of Analysis is a document reporting test results for a material or product against specified criteria.

Depending on the product and laboratory, a COA may include information about:

• identity
• potency or concentration
• microbial testing
• heavy metals
• other contaminants

A COA can improve transparency, but simply displaying a document labeled “COA” does not automatically prove the testing was comprehensive or independent.

Useful questions include:

• Does the document identify the relevant batch or lot?
• Which laboratory performed the analysis?
• What methods were used?
• What specifications were applied?
• Does the report correspond to the product being purchased?

Are Dietary Supplements FDA Approved?

No. FDA does not approve ordinary dietary supplements for safety and effectiveness before they are marketed in the same way it approves drugs.

Under the current U.S. regulatory framework, supplement companies are responsible for ensuring that products comply with applicable safety, manufacturing, labeling and claim requirements.

FDA explains: Information for Consumers on Using Dietary Supplements .

Therefore, phrases such as “FDA-approved supplement” should not be used to imply that FDA reviewed and approved an ordinary supplement for effectiveness before sale.

FDA Registered vs FDA Approved: What Is the Difference?

Facility registration and product approval are different concepts.

A facility being subject to FDA registration requirements does not mean that every supplement manufactured there has been FDA approved for effectiveness.

Similarly, FDA inspection, registration or compliance with manufacturing regulations should not be presented as evidence that FDA endorses the product's clinical claims.

What Does GMP Mean on Supplements?

GMP refers to Good Manufacturing Practice.

FDA has Current Good Manufacturing Practice requirements that apply to dietary supplement manufacturing, packaging, labeling and holding operations.

These requirements address manufacturing quality and controls.

See: FDA Current Good Manufacturing Practices .

GMP compliance should not be confused with proof that a supplement produces a particular clinical outcome.

How Are Supplement Claims Regulated?

Not every claim appearing on a supplement label means the same thing legally or scientifically.

FDA distinguishes between categories including:

• nutrient-content claims
• health claims
• structure/function claims

Structure/function claims can describe how an ingredient affects normal body structure or function but are different from claims that a product diagnoses, treats, cures or prevents disease.

FDA explains the distinction here: FDA Structure/Function Claims .

This distinction matters when evaluating marketing language. A legally permitted structure/function statement should not automatically be interpreted as proof of a large clinical effect.

Does “Natural” Mean a Supplement Is Safe?

No. Natural does not automatically mean safe, effective or superior.

Plants and other natural substances can contain biologically active compounds capable of producing benefits, side effects and medication interactions.

The National Center for Complementary and Integrative Health specifically warns that “natural” should not be assumed to mean safe.

Read: NCCIH — What Consumers Need to Know About Dietary Supplements .

Does Supplement Bioavailability Matter?

Bioavailability describes how much of a substance becomes available to the body after administration.

Ingredient form can matter for some nutrients because different forms may vary in absorption, tolerability or metabolism.

But higher measured absorption does not automatically guarantee a larger health or performance benefit.

Clinical outcomes still matter.

NutriClaw's Vitamin D3, K2 & Calcium Guide discusses examples such as D2 versus D3, K2 forms and calcium citrate versus calcium carbonate in greater detail.

How to Compare Two Supplements

Instead of comparing front labels, compare the information that changes the actual value of the product.

Are Expensive Supplements Better?

Not necessarily.

Price can reflect ingredient cost, manufacturing, packaging, branding, certification, distribution or marketing.

A more expensive product may offer meaningful advantages, but price itself does not establish effectiveness or quality.

A better comparison is:

cost per evidence-relevant serving

rather than:

cost per bottle.

Supplement Safety and Medication Interactions

Dietary supplements can interact with prescription medicines, over-the-counter medicines and other supplements.

Some interactions can increase an effect, while others can reduce medication effectiveness or increase side-effect risk.

NCCIH discusses these risks in: Using Dietary Supplements Wisely .

Anyone using regular prescription medication, managing a medical condition, preparing for surgery, or considering supplements during pregnancy or breastfeeding should review relevant ingredients with an appropriate healthcare professional.

Can You Take Multiple Supplements Together?

Sometimes, but the answer depends on the ingredients.

The main mistake is evaluating every product separately while ignoring the combined daily intake.

For example:

• a multivitamin may overlap with a separate vitamin product
• a pre-workout and energy product may both contain caffeine
• several products may contain the same botanical extract
• multiple formulas may contribute the same mineral

Always compare the complete labels rather than assuming that products sold in different categories contain different ingredients.

How to Avoid Duplicate Ingredients

Use a simple ingredient inventory.

List every supplement used regularly and record:

• ingredient
• amount per serving
• servings per day
• other known dietary sources where relevant

Pay particular attention to:

• caffeine and other stimulants
• fat-soluble vitamins
• minerals
• multi-ingredient herbal products

More ingredients do not automatically mean a better formula.

What Supplements Should Not Be Taken Together?

There is no accurate universal list covering every supplement combination.

Interactions depend on dose, timing, medication use, health conditions and the specific compounds involved.

Some nutrients can affect the absorption of other nutrients or medications, while some botanical ingredients can influence drug metabolism or physiological effects.

For this reason, the safer strategy is to evaluate the exact combination rather than rely on simplistic internet lists of “good” and “bad” supplement pairs.

Supplement Marketing Red Flags

No single marketing phrase proves a product is bad, but several patterns should make you investigate more carefully.

Potential red flags include:

• claims of guaranteed results
• claims that one product works for nearly everyone
• extremely rapid transformation promises
• language implying an ordinary supplement is FDA approved
• disease-treatment claims presented as supplement benefits
• “clinically proven” claims without identifying the relevant research
• proprietary blends hiding important ingredient amounts
• “third-party tested” claims with no indication of what testing occurred
• before-and-after images used as though they establish clinical efficacy
• very large ingredient lists with no explanation of meaningful doses
• “natural” used as a substitute for safety evidence
• unsupported claims that one brand is categorically the “best”

How to Research a Supplement Ingredient

A good research sequence moves from broad summaries toward original evidence.

1. Define the outcome. Do not search only the ingredient name. Search the ingredient plus the exact question, such as strength, sleep, deficiency, body composition or safety.
2. Look for systematic reviews and meta-analyses. They can provide a broader view than one isolated study.
3. Review randomized controlled trials where relevant. Check dose, duration and population.
4. Check authoritative safety sources. FDA, NIH and NCCIH provide regulatory and safety information for many supplement topics.
5. Compare the evidence with the actual product label. Confirm whether the ingredient form and amount correspond reasonably with the research.

How to Choose Supplements by Goal

Different goals require different evidence. A supplement should not be evaluated simply because it belongs to a popular category.

Protein & Muscle Nutrition

Protein supplements can help make adequate protein intake more convenient. Their value depends largely on total protein needs, dietary intake and product composition.

Read the NutriClaw Whey Protein Isolate Guide .

Creatine & Strength Training

Creatine monohydrate is one of the most extensively studied sports-nutrition ingredients for repeated high-intensity exercise and resistance training.

Read the NutriClaw Creatine Monohydrate Guide .

Amino Acids

Amino-acid supplements should be evaluated in the context of total dietary protein and the function of the specific amino acid being considered.

Read the NutriClaw Amino Acids Guide , the BCAA Guide and the L-Glutamine Guide .

Pre-Workout & Training Support

Pre-workout products can contain stimulants, creatine, amino acids and many other ingredients, so the category should be evaluated ingredient by ingredient.

Read the NutriClaw Pre-Workout Supplements Guide .

Vitamins & Minerals

Vitamins and minerals are essential nutrients, but supplementation is most meaningful when there is a dietary need, increased requirement or another evidence-based reason for use.

Read the NutriClaw Complete Vitamins Guide and the Vitamin D3, K2 & Calcium Guide .

Botanical Supplements

Botanical ingredients can have genuine biological effects, but evidence, standardization, dose, interactions and safety differ substantially by ingredient.

Read the NutriClaw Ashwagandha Guide .

5-HTP

5-HTP deserves additional caution because of its role in serotonin pathways and potential interaction concerns.

Read the NutriClaw 5-HTP Evidence & Safety Guide .

Fat Burners & Weight-Management Supplements

Evaluate weight-management ingredients by separating acute mechanisms such as thermogenesis or fat oxidation from meaningful long-term body-composition outcomes.

Read the NutriClaw Fat Burner Supplements Guide .

Testosterone-Support Supplements

Botanical or nutrient-based testosterone-support products should be evaluated according to the specific ingredient, population and measured outcome rather than assuming that every “testosterone booster” reliably increases testosterone or muscle growth.

Read the NutriClaw Testosterone Boosters Guide .

What Should Athletes Look for in Supplements?

Athletes have an additional concern: contamination with substances prohibited by their sport.

Important considerations include:

• transparent ingredient amounts
• total stimulant intake
• evidence relevant to performance
• competition rules
• recognized sport-certification programs where relevant

A product being legal for sale does not automatically mean it is appropriate for every competitive athlete.

How NutriClaw Approaches Supplement Education

NutriClaw's supplement guides are organized around a simple principle: evaluate the ingredient before evaluating the marketing.

The education library separates:

• what an ingredient is
• how it is proposed to work
• what human research shows
• where evidence is stronger or weaker
• common dosage and timing questions
• side effects and interactions
• how the ingredient relates to a supplement category

You can browse NutriClaw supplements or start with the official NutriClaw brand and supplement guide .

Supplement Evaluation Checklist

Frequently Asked Questions About Choosing Supplements

How do I know if a supplement is good?

Start with evidence for the ingredient and outcome, then check whether the product provides an appropriate disclosed dose, transparent labeling, relevant quality information and an acceptable safety profile.

How do I know what supplements I need?

Identify a specific nutritional or performance need first. Diet, laboratory results where appropriate, health status, medication use, training goals and professional guidance can all affect whether a supplement is useful.

Are supplements necessary?

Not universally. Some people can meet their nutritional needs through food, while supplements can be useful in specific circumstances or for particular evidence-based goals.

How do you read a Supplement Facts label?

Start with serving size, then check ingredient amounts, ingredient forms, % Daily Value where relevant, proprietary blends, other ingredients and warnings.

What does Daily Value mean on supplements?

Daily Value is an FDA reference amount. % Daily Value shows how much one serving contributes to that reference amount for nutrients with established Daily Values.

What does “Daily Value not established” mean?

It means FDA has not established a Daily Value for that dietary ingredient. It does not by itself establish whether the ingredient is effective or ineffective.

What is a proprietary blend?

A proprietary blend combines several dietary ingredients under one blend name. The total blend weight is disclosed, but exact individual amounts may not be, which can make dose evaluation more difficult.

Are proprietary blends bad?

Not automatically. Their main disadvantage is reduced dose transparency, which makes comparison with research and competing products harder.

What does third-party tested mean?

It means testing was performed by an organization separate from the manufacturer. The value of the claim depends on what was tested, who performed the testing, which standards were used and how often testing occurs.

Is third-party testing the same as certification?

No. Independent testing can refer to a particular laboratory analysis, while certification programs apply defined verification requirements before allowing qualifying products to use the relevant certification mark.

Does third-party testing prove a supplement works?

No. Quality testing can help verify characteristics such as identity, purity or contaminants depending on the test, but it does not automatically establish that a supplement produces a clinical benefit.

Are dietary supplements FDA approved?

No. FDA does not pre-approve ordinary dietary supplements for safety and effectiveness before marketing in the way it approves drugs.

Does an FDA-registered facility mean the supplement is FDA approved?

No. Facility registration and product approval are separate concepts. A registered facility does not mean FDA approved the supplement's effectiveness.

What does GMP mean?

GMP refers to Good Manufacturing Practice. Dietary supplement manufacturers are subject to applicable current Good Manufacturing Practice requirements governing manufacturing and quality-control processes.

Does GMP certification mean the supplement works?

No. Manufacturing quality and clinical effectiveness are different questions. A product can be manufactured correctly without its marketing claims necessarily being supported by strong clinical evidence.

Does “natural” mean a supplement is safe?

No. Natural ingredients can still produce side effects, interact with medication or be inappropriate for some people.

Can supplements interact with medication?

Yes. Some dietary ingredients can increase or decrease medication effects or create additional side-effect risks. Specific combinations should be checked individually.

Can I take several supplements together?

Sometimes, but review all labels together for duplicated nutrients, stimulant overlap, botanical interactions and total daily intake.

What supplements should not be taken together?

There is no reliable universal list. Interactions depend on the exact ingredients, doses, timing, medicines and individual health circumstances.

Are expensive supplements better?

Not necessarily. Compare evidence, ingredient form, dose, transparency, testing or certification, serving count and cost per meaningful serving instead of using price alone as a quality signal.

Does “clinically studied” mean a supplement works?

Not necessarily. Determine whether the research tested the individual ingredient, a similar formulation or the exact finished product, and whether the dose and studied population match the claim being made.

How can I tell if supplement claims are legitimate?

Look for clearly defined outcomes, links to relevant human evidence, disclosed ingredient amounts and realistic wording. Be skeptical of guarantees, dramatic transformations and claims that go substantially beyond the research.

Is protein powder necessary to build muscle?

No. Protein powder is primarily a convenient way to help meet protein needs. Whole-food protein can also support muscle growth when total intake is adequate.

For more detail, read the Whey Protein Isolate Guide .

Is creatine a good supplement for strength training?

Creatine monohydrate has extensive human research supporting its use for repeated high-intensity exercise and resistance-training performance.

Read the Creatine Monohydrate Guide .

Conclusion: How to Choose Supplements More Intelligently

The best supplement decision begins with a question, not a product.

First decide what outcome you are trying to achieve. Then determine whether supplementation is actually useful for that goal.

If it is, evaluate the ingredient evidence, dose, ingredient form, Supplement Facts panel, proprietary blends, quality verification, safety information and interactions.

Remember the distinctions that matter:

• ingredient evidence is not automatically finished-product evidence
• third-party testing is not the same as proof of effectiveness
• FDA registration is not FDA product approval
• GMP relates to manufacturing, not guaranteed clinical results
• natural does not automatically mean safe
• more ingredients and higher doses do not automatically mean a better supplement

The goal is not to find the supplement with the most impressive front label.

The goal is to find a product whose purpose, evidence, dose, transparency and safety make sense for the reason you are considering it.

Research and Further Reading

U.S. Food and Drug Administration — Information for Consumers on Using Dietary Supplements

U.S. Food and Drug Administration — Questions and Answers on Dietary Supplements

FDA — Dietary Supplement Labeling Guide: Supplement Facts and Proprietary Blends

FDA — Daily Value on Nutrition and Supplement Facts Labels

FDA — Structure/Function Claims for Dietary Supplements

FDA — Current Good Manufacturing Practices for Dietary Supplements

NCCIH — What Consumers Need to Know About Dietary Supplements

NCCIH — Using Dietary Supplements Wisely

NSF — Certified for Sport Program

USP — Dietary Supplement Verification Program