What Supplement Brands Can't Say — And What to Say Instead

The DSHEA Framework: What It Permits and Why

The Dietary Supplement Health and Education Act of 1994 is the foundational US regulation for the supplement industry. Before DSHEA, dietary supplements were regulated under a patchwork of food and drug laws that made it difficult for brands to make any benefit claims without FDA pre-approval. DSHEA created a middle ground: a specific regulatory category for products that are neither foods (which can only make nutrient content claims) nor drugs (which require FDA pre-approval for all therapeutic claims).

DSHEA's key provision for supplement advertising is the structure/function claim framework. A structure/function claim describes the role of a nutrient or dietary ingredient in affecting normal structure or function in humans. It does not diagnose, treat, cure, or prevent any disease — that's the exclusive domain of FDA-approved drugs.

The tradeoff DSHEA made: supplement brands can use structure/function claims without FDA pre-approval, but they must:

• Ensure the claim is truthful and not misleading
• Have substantiation — competent and reliable scientific evidence — to support the claim
• Include the required FDA disclaimer prominently on the label and in advertising
• Notify the FDA within 30 days of first marketing a product using a new structure/function claim

The key compliance challenge DSHEA creates is that the boundary between a permitted structure/function claim and a prohibited disease claim is not always obvious. The FTC and FDA have issued guidance over the years that clarifies many specific cases, but new products, new ingredients, and new marketing channels continue to generate grey areas that brands and their copywriters must navigate carefully.

Why Disease Claims Are Absolutely Off Limits

Disease claims — statements that a product diagnoses, treats, cures, or prevents a disease — require FDA drug approval. Getting FDA drug approval for a pharmaceutical requires randomized controlled clinical trials, a New Drug Application (NDA), FDA review, and typically hundreds of millions of dollars and several years. No dietary supplement brand has undergone this process for their supplement products, which means no supplement brand is legally permitted to make disease claims.

The FTC enforces the disease claim prohibition on the advertising side (the FTC Act prohibits false and misleading advertising), while the FDA enforces it on the labeling side (DSHEA and the FDC Act). Both agencies coordinate on enforcement, meaning a supplement brand making disease claims faces potential action from both regulators simultaneously.

The Complete Permitted vs. Prohibited Table

The Highest-Risk Supplement Categories

Not all supplement categories carry equal regulatory risk. The FTC allocates enforcement resources based on consumer harm potential and complaint volume. Understanding which categories are under the highest scrutiny helps brands calibrate their compliance investment appropriately.

Weight Loss Supplements: Highest Enforcement Priority

Weight loss is the FTC's most consistently enforced supplement category. The FTC has taken action against hundreds of weight loss supplement brands over the past two decades, and enforcement activity has accelerated in recent years with the explosion of GLP-1 drug marketing creating a comparison environment for supplement brands tempted to make similar efficacy claims.

The core compliance rule for weight loss supplements: any claim that a product causes weight loss — as opposed to supporting weight management as part of a healthy diet and exercise program — is a disease claim (obesity is a medical condition) and requires FDA drug approval. This includes "burns fat," "melts belly fat," "accelerates weight loss," "clinically proven fat burner," and any specific quantified weight loss claim ("lose 10 pounds in 30 days").

Blood Sugar and Diabetes: Critical Precision Required

Blood sugar is one of the most linguistically precise supplement categories. The FTC-compliant formulation — "helps maintain blood sugar levels already within normal range" — is very specific in what it claims. It says the product helps maintain levels that are already normal. It does not claim to lower elevated blood sugar, normalize diabetic blood sugar levels, or substitute for diabetes management.

Any supplement claiming to lower blood sugar, control blood sugar in people with diabetes, or reduce A1C levels is making a disease claim (diabetes is a disease) and requires FDA drug approval. This distinction matters enormously given that many chromium, berberine, cinnamon, and blood sugar support supplement brands regularly push into prohibited territory.

Immune Health: Post-COVID Scrutiny

Immune health claims were the highest-volume FTC enforcement target in 2020-2022, when thousands of supplement brands made COVID-19 prevention or treatment claims. The FTC issued warning letters to hundreds of companies and took enforcement action against dozens. While COVID-specific claims have declined, immune health claims remain under elevated scrutiny — particularly any claim suggesting a supplement prevents specific infectious diseases.

Why Qualifiers Don't Fix Prohibited Claims

The qualifier problem is one of the most widespread misconceptions in supplement marketing. Brands and their copywriters add "may" or "helps" before a claim and believe they have created a legal buffer. They have not — and the FTC has specifically addressed this.

The FTC evaluates advertising claims based on what it calls the "net impression" — the overall message a reasonable consumer would take away from the advertising. Consumer research has consistently shown that people interpret modifiers like "may help" positively. When a consumer reads "may help lower blood sugar," they hear "lowers blood sugar with some uncertainty attached" — not "this is an unproven claim." The net impression is still a disease claim.

Common Qualifier Failures

These are real examples of claim structures that brands use believing they are compliant — and that are not:

• "May help treat arthritis" — "may help treat" is still making a disease claim (treating arthritis). The "may" does not fix it.
• "Shown in preliminary research to reduce inflammation associated with joint disease" — "joint disease" is a disease reference. Preliminary research does not cure insufficient substantiation.
• "Some users report improved blood sugar control" — testimonial framing does not exempt disease claims. The brand is responsible for claims made through testimonials.
• "Supports healthy immune function to help prevent getting sick" — "help prevent getting sick" implies prevention of illness (disease). The "supports healthy immune function" portion is compliant; the second half converts it into a disease claim.

What Actually Works: The Structure/Function Formulation

The correct approach is not to add qualifiers to disease claims — it's to start with a claim that is conceptually a structure/function claim from the beginning. Structure/function claims don't describe disease outcomes; they describe body functions. "Supports healthy sleep patterns" doesn't say "cures insomnia" with a qualifier on top — it makes a fundamentally different claim about a body function (sleep patterns) rather than a disease state (insomnia).

Bioavailability Language: A Compliance-Safe Conversion Tool

One of the most effective ways to write compelling supplement copy that converts well AND stays compliant is to focus on bioavailability — the science of why ingredient form matters. This approach works because:

1. It is factually accurate and verifiable — bioavailability differences between ingredient forms are documented in the scientific literature
2. It speaks to the ingredient-literate supplement buyer who researches products before purchasing
3. It justifies premium pricing without making any therapeutic claims
4. It is entirely compliant — explaining why an ingredient form absorbs better is a factual statement, not a health claim

Bioavailability Examples That Convert

Dosage Transparency as a Compliance-Safe Conversion Signal

Alongside bioavailability, dosage transparency is one of the most effective compliance-safe conversion tools for supplement copy. Supplement buyers who research products compare mg per serving, servings per container, and ingredient forms across competing products before purchasing. Copy that includes these details — and explains why they matter — converts better and doesn't require any health claims.

Examples: "400mg magnesium glycinate per serving — 90 servings, a full 3-month supply at the recommended daily dose." "10mg zinc bisglycinate — the therapeutic dose used in clinical research on zinc and immune health." These are factual statements about the product that inform the purchase decision without making any therapeutic claims.

The Required FDA Disclaimer and When It Applies

The required FDA disclaimer is not optional for digital supplement advertising that uses structure/function claims. The DSHEA requirement applies to labeling; the FTC extends it to all advertising as a best-practice standard. The disclaimer must:

• Appear prominently — not in 6-point text buried at the bottom of a product page
• Be placed near the claim — on the same page as the structure/function claim, not in a general disclaimer page linked elsewhere
• Use the exact language — paraphrasing the disclaimer is not compliant
• Apply to every structure/function claim — one disclaimer on a page covers all structure/function claims on that page

The disclaimer does NOT protect a disease claim. A product page that says "cures arthritis" followed by "These statements have not been evaluated by the FDA..." is still making a disease claim — the disclaimer only applies to legitimate structure/function claims.

Market-by-Market Compliance: US, UK, AU, CA

Why WriteLift Uses the Strictest-Common-Denominator Approach

Many supplement brands sell in multiple markets simultaneously — US and UK, or US, UK, and Australia. Creating separate compliant copy for each market is the most rigorous approach and what WriteLift recommends for brands with material sales in multiple jurisdictions. When a single piece of copy must serve all markets, WriteLift defaults to the most restrictive applicable standard — which in practice means UK NHC Register compliance for supplements. Copy that passes UK NHC review is typically compliant in the US, Australia, and Canada as well, though it may be more conservative than what DSHEA would technically permit in the US market alone.

Amazon-Specific Rules for Supplement Copy

Amazon is the largest single channel for US supplement sales, which makes Amazon-specific compliance rules essential for any brand selling on the platform. Amazon's approach to supplement compliance combines FTC/FDA rule enforcement with Amazon's own platform policies.

The March 2026 Ingredient Claim Requirement

From March 31, 2026, Amazon requires that every ingredient claim appearing anywhere on a supplement product detail page — title, bullets, description, images, A+ Content, backend search terms — exactly matches the Supplement Facts Panel in name, weight, and presentation. The prohibition on "raw material equivalent" claims is the most commonly violated aspect of this policy.

Raw material equivalent: a supplement uses "10,000mg raw garlic equivalent" in copy when the Supplement Facts Panel shows "500mg garlic extract (2% allicin)." These are different numbers representing different things, and Amazon now prohibits using the raw material equivalent framing. The copy must say "500mg garlic extract" — matching the Supplement Facts Panel exactly.

What Amazon Scans

• Listing title, bullet points, and product description
• Any text appearing in product images (label photography, lifestyle imagery with text)
• All A+ Content modules — every text element
• Backend search terms (not visible to consumers but scanned by Amazon's systems)
• The seller's external brand website — Shopify, WooCommerce, or any other platform

That last point catches many brands by surprise. If your Amazon listing and your Shopify product page show different ingredient amounts for the same product, Amazon's system may detect the discrepancy and suppress the Amazon listing. The enforcement is cross-platform.

Writing Better Supplement Copy Without Crossing the Line

There is a common misconception that compliant supplement copy must be weak, vague, or unconvincing. It's not true. The most effective supplement copy in the market typically doesn't rely on strong health claims at all — it uses ingredient authority, formulation transparency, and third-party validation to build the trust that drives conversions.

The Four Pillars of High-Converting Compliant Supplement Copy

1. Ingredient authority: Name the specific form of each ingredient and explain why that form matters. "Magnesium glycinate (chelated for superior absorption)" tells a more compelling story than "magnesium supplement" — and makes no health claims.

2. Dosage transparency: "400mg per serving, 90 servings per bottle" gives buyers the information they need to compare your product against competitors. It also signals a brand that isn't hiding behind vague quantities.

3. Third-party validation: "NSF Certified," "USP Verified," "GMP Certified facility," "third-party tested for purity and potency" — these trust signals address the purchase hesitation that stops first-time supplement buyers. They require no health claims.

4. Precise structure/function framing: "Supports healthy sleep patterns" is specific enough to be meaningful without making a disease claim. "Helps maintain joint flexibility during and after exercise" ties the claim to an activity context that makes it more concrete without naming a disease. Getting the structure/function language precise is a skill — and it's the core of what compliant supplement copywriting delivers.

For more on how WriteLift applies these principles across Shopify and Amazon supplement listings, see our guide on the WriteLift supplement copywriting service. For the FTC liability context behind these rules, see our article on FTC liability for supplement advertising.

Frequently Asked Questions