Sports and performance supplements occupy a uniquely regulated space: the category has a history of adulteration with undeclared drugs, an active enforcement environment, and consumer marketing that regularly pushes against the boundaries of permissible claims. Understanding the line between lawful structure/function claims and unlawful drug claims — and what FTC requires to substantiate performance claims — is essential for brands in this space.
The Core Regulatory Framework
Sports supplements are dietary supplements regulated under DSHEA. They must comply with:
FDA labeling requirements — Supplement Facts panel, ingredient list, structure/function claims with disclaimer
FDA cGMP requirements — manufacturing quality under 21 CFR Part 111
FTC advertising standards — substantiation for all performance, efficacy, and benefit claims
FDA ingredient safety — only lawful dietary ingredients may be included
Permissible vs. Prohibited Claim Language
Performance and Energy Claims
Permissible S/F Claim | Prohibited Drug/Disease Claim |
|---|---|
"Supports energy metabolism" | "Treats chronic fatigue" |
"Helps maintain energy levels during exercise" | "Cures exercise-induced fatigue" |
"Contains caffeine, which is associated with increased alertness" | "Treats attention deficit disorder" |
"Supports endurance during athletic performance" | "Prevents exercise-induced asthma" |
Muscle and Body Composition Claims
Permissible S/F Claim | Prohibited Drug/Disease Claim |
|---|---|
"Supports muscle growth when combined with resistance training" | "Treats muscle atrophy" |
"Helps maintain lean muscle mass" | "Treats sarcopenia" |
"Supports healthy testosterone levels already in the normal range" | "Treats low testosterone" / "Treats hypogonadism" |
"Supports protein synthesis" | "Anabolic" when used in a drug-like context (see below) |
Weight Management Claims
Permissible S/F Claim | Prohibited Drug/Disease Claim |
|---|---|
"Supports healthy body composition when combined with diet and exercise" | "Treats obesity" |
"Helps maintain a healthy weight" | "Eliminates excess body fat" |
"May support fat metabolism" | "Prevents weight regain after bariatric surgery" |
"Anabolic" Language: A High-Risk Term
The term "anabolic" — widely used in sports supplement marketing — is a steroid pharmacology term. When used in supplement marketing, it may imply drug-like mechanisms and drug-level efficacy. FDA has taken the position that products marketed with "anabolic" language may be intended to function as drugs.
More broadly, marketing that positions a supplement as functioning similarly to anabolic steroids — even without using the word "anabolic" — risks FDA classification as a drug based on the totality of circumstances (product name, marketing, implied mechanism).
Prohormones and Designer Steroids: Not Lawful Supplements
A major FDA enforcement priority in the sports supplement category has been prohormones and designer anabolic steroids marketed as dietary supplements. These products:
Contain synthetic steroidal compounds that are not dietary ingredients under DSHEA
Are often sold as "testosterone boosters" or "muscle builders" with claims designed to mimic steroid marketing without explicitly referencing steroids
May trigger the drug exclusion under 21 U.S.C. 321(ff)(3)(B) because the compounds were developed as drugs before being marketed as supplements
FDA has seized products and issued warning letters to numerous sports supplement companies for selling designer steroids. The passage of the Designer Anabolic Steroid Control Act (DASCA) in 2014 further classified many designer steroids as Schedule III controlled substances.
Stimulant Ingredients: DMAA, DMHA, and Ephedra
Several stimulant ingredients have been banned from dietary supplements by FDA:
Ephedrine alkaloids (ephedra): FDA banned these in 2004 following deaths associated with ephedra-containing weight loss and sports supplements. Products containing ephedrine alkaloids are illegal.
DMAA (1,3-dimethylamylamine): FDA has taken the position that DMAA (a synthetic stimulant) is not a lawful dietary ingredient. FDA has sent warning letters and seized DMAA-containing products.
DMHA (1,5-dimethylhexylamine): FDA has stated that DMHA does not meet the definition of a dietary ingredient and has warned against products containing it.
Brands that source pre-workout ingredient blends should verify that none of the blend components contain these or similar synthetic stimulants that FDA has determined are not lawful supplement ingredients.
Weight Loss Claims: FTC's Most Enforced Category
Weight loss is the most heavily enforced category in FTC's supplement advertising docket. FTC's "Gut Check" guidance identifies specific claim categories that have faced significant enforcement:
"Clinically proven to cause weight loss" — requires at least two well-designed RCTs
"Lose [specific amount] in [specific time]" — requires that the claimed loss is typical, not atypical
"Targets belly fat" or "spot reduction" claims — no credible scientific evidence supports spot fat reduction
Claims that products work "without diet or exercise" — effectively unfounded for any supplement
Testimonials showing dramatic weight loss that is not typical
FTC consent orders for weight loss supplement companies routinely require two RCTs before any future efficacy claim, plus a prohibition on testimonials without clear typical-result disclosures.
The "Clinically Studied Ingredient" Claim
Many sports supplement brands reference clinical studies on specific ingredients (e.g., creatine, beta-alanine, HMB) to support their product claims. This approach is permissible if:
The studies are real and accurately characterized
The dose in the product is the dose used in the studies
The form in the product matches the form studied
The claimed effect is what the studies actually show
Using a low dose of a well-studied ingredient while claiming the same benefits as the high-dose clinical studies is misleading and not adequately substantiated.
NSF Certified for Sport: The Standard for Athletic-Channel Distribution
For brands selling through professional sports, military, or collegiate athletic channels, NSF Certified for Sport certification is effectively required. This certification verifies that every production lot is free from WADA-banned substances — a critical requirement for athletes subject to drug testing.
Brands targeting professional athletes, college athletes, or military consumers without NSF Certified for Sport (or equivalent Informed Sport) certification are excluded from most professional and collegiate athletic programs.
How Truli Helps with Sports Supplement Claim Compliance
Performance claim analysis: Truli evaluates sports supplement claims against the S/F vs. disease claim framework, flagging anabolic, drug-like, or disease claim language
Ingredient safety screening: Truli cross-references ingredient lists against FDA warning letters and banned substance lists to identify potentially unlawful dietary ingredients
FTC weight loss claim substantiation review: Truli maps weight loss and body composition advertising claims against available clinical evidence for substantiation assessment
Athlete-channel certification tracking: Truli tracks NSF Certified for Sport and Informed Sport certification status for products distributed in athletic channels
Related Regulations
FDA Drug-Supplement Boundary — When a supplement becomes an unapproved drug
DSHEA — The statutory framework for supplement marketing and safety
FTC Substantiation Standard for Supplements — What evidence is required for performance and body composition claims
FDA Structure/Function Claims for Supplements — The claim framework for sports supplements
FDA Supplement Third-Party Testing — NSF Certified for Sport and Informed Sport certification
Frequently Asked Questions
Can we say our pre-workout is "clinically proven"?
Only if you have at least two well-designed RCTs demonstrating the specific claimed outcome for your specific product (not just for individual ingredients in isolation). If you're relying on studies of individual ingredients, "clinically studied ingredient" or "backed by clinical research" is more accurate than "clinically proven product." The distinction matters — FTC evaluates the net impression, and "clinically proven" implies a level of evidence that individual ingredient studies typically cannot support.
We want to use "testosterone booster" in our product name. Is that allowed?
"Testosterone booster" as a product name strongly implies the product increases testosterone levels — which could be characterized as treating low testosterone (a disease/condition). FDA may evaluate product names as part of the totality of circumstances for intended use. Many brands use testosterone-adjacent language ("T-support," "testosterone support formula") that is less likely to imply drug-level efficacy. Legal review of the specific name in context is advisable.
Our product contains DHEA. Is that a lawful supplement ingredient?
DHEA (dehydroepiandrosterone) is considered a lawful dietary supplement ingredient by FDA for adults. It is distinguished from synthetic anabolic steroids. However, DHEA is a controlled substance in some countries and is banned by WADA for athletic competition. Products containing DHEA should not bear NSF Certified for Sport certification and may be inappropriate for athletic use.
A note from Truli: Truli is not a law firm, and this article does not constitute or contain legal advice or create an attorney-client relationship. When determining your obligations and compliance with respect to relevant laws and regulations, you should consult a licensed attorney.
Last updated: April 2026. FDA enforcement in the sports supplement category is ongoing. Truli monitors FDA warning letters, seizures, and FTC enforcement actions targeting sports and performance supplement brands. Book a demo to see how Truli monitors supplement compliance.
