Don't Risk an FDA Warning Letter Over Your Supplement Label
A product that's already selling can be flagged overnight for a labeling violation — even when it's perfectly safe. Here's what actually triggers these letters, grounded in the rules, and how to stay clear.
Key Takeaways
- Disease claims are the #1 trigger — they reclassify a supplement as an unapproved drug (21 CFR 101.93).
- Structure/function claims are allowed — with the DSHEA disclaimer and a notification to FDA within 30 days of first marketing.
- Supplements use a Supplement Facts panel (21 CFR 101.36), not Nutrition Facts.
- The label must say "dietary supplement," declare all 9 allergens (FALCPA), and name a U.S. responsible firm.
- Your website and social media count as labeling — disease claims there can trigger a letter too.
- Warning letters are public, request a response in ~15 working days, and can escalate to seizure, injunction, or import refusal.
Structure/Function Claims vs. Disease Claims
Under DSHEA, a supplement may describe how an ingredient affects the normal structure or function of the body. It may not claim to diagnose, treat, cure, prevent, or mitigate a disease — that's a drug claim. The difference is entirely in the wording:
| Allowed — structure/function | Not allowed — disease claim |
|---|---|
| ✓ "Supports memory" | ✗ "Treats Alzheimer's" |
| ✓ "Helps maintain healthy cholesterol already in the normal range" | ✗ "Lowers high cholesterol" |
| ✓ "Supports joint comfort" | ✗ "Treats arthritis" |
| ✓ "Supports respiratory health" | ✗ "Cures colds and flu" |
| ✓ "Helps maintain healthy blood sugar already in the normal range" | ✗ "Treats diabetes" |
The DSHEA Disclaimer
Any label carrying a structure/function claim must display the DSHEA disclaimer, in boldface, linked to the claim (typically with an asterisk):
You must also notify FDA within 30 days of first marketing the supplement with that claim (via FDA's electronic portal). The notification is not approval — substantiation stays your responsibility.
The 7 Label Violations That Trigger Warning Letters
| Violation | Why it's a problem | Reg |
|---|---|---|
| 1. Disease claims (highest risk) | Makes the product an unapproved new drug and misbranded | 101.93 |
| 2. Incorrect Supplement Facts | Wrong format or inaccurate amounts | 101.36 |
| 3. Missing "dietary supplement" identity | Product not clearly identified | 101.3 |
| 4. Incomplete ingredient disclosure | Missing "other ingredients" or mislisting | 101.4 |
| 5. Missing U.S. responsible firm | Required name and address absent | 101.5 |
| 6. Allergen labeling errors | Undeclared major allergen (FALCPA applies) | FALCPA |
| 7. Misleading / unsubstantiated claims | Exaggerated or unsupported statements | FD&C Act |
What Happens — and Why It Hurts
You must respond fast
FDA typically wants a written response within ~15 working days, with corrective actions and timelines.
Relabel & pull claims
You'll usually need to correct the label and remove non-compliant claims before selling continues.
It's public
FDA posts warning letters. Customers, competitors, retailers, and investors can all see it.
Marketplace removal & escalation
Amazon and others often delist flagged products; ignoring the letter can lead to seizure, injunction, or import refusal.
How to Stay Out of Warning-Letter Territory
Audit every claim
Across the label, website, and marketing — keep to structure/function language, remove anything that reads as treating or preventing a disease.
Add the DSHEA disclaimer correctly
Boldface, linked to each claim, and file the 30-day notification with FDA.
Verify Supplement Facts & identity
Correct 101.36 panel and a clear "dietary supplement" statement of identity.
Complete ingredients, allergens & firm
All dietary and other ingredients, the 9 allergens, and the U.S. responsible firm.
Substantiate your claims
Each structure/function claim must be truthful, not misleading, and supported by evidence you can produce.
Review before production
Have the label and marketing reviewed against FDA rules before printing and selling.
Catch the Problem Before FDA Does
The claim that reads as a disease claim, the disclaimer that isn't linked right, the allergen hiding in an ingredient — these are exactly what a review catches before your product is on the market and visible to FDA. FDA Registration Assistance reviews your supplement label and marketing against the structure/function line, the DSHEA disclaimer, the allergen rules, and the Supplement Facts panel, and returns clear corrections.
Contact us at info@fdaregistrationassistance.com or call +1 (928) 275-8333. Trusted by 1,000+ clients across 135+ countries, with 15+ years of FDA experience.
Frequently Asked Questions — Supplement Labels & FDA Warning Letters
1. What triggers an FDA warning letter for a supplement?
Most often a disease claim — language implying the product treats, cures, or prevents a disease — which makes it an unapproved drug and misbranded. Also: incorrect Supplement Facts, missing "dietary supplement" identity, a missing or mis-linked DSHEA disclaimer, incomplete ingredients, undeclared allergens, no U.S. responsible firm, and misleading claims.
2. Does FDA approve supplement labels before market?
No. FDA doesn't pre-approve them, but it monitors the market and issues warning letters for non-compliant labels or marketing. The responsibility to get it right before selling is entirely the brand's.
3. Structure/function claim vs. disease claim — what's the difference?
Structure/function describes an effect on normal body structure or function ("supports memory") and is allowed with the DSHEA disclaimer. A disease claim ("treats Alzheimer's") states or implies treating/curing/preventing a disease and is not allowed — it makes the product a drug.
4. Can one word turn my supplement into a drug?
Yes. "Supports joint comfort" is fine; "treats arthritis" is a disease claim. The difference is the specific wording — which is why claim review is so valuable.
5. What is the DSHEA disclaimer and when do I need it?
With any structure/function claim, the label must carry: "This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease." Under 101.93 it's boldface and linked to each claim, and you notify FDA within 30 days of first marketing.
6. Do I still need the disclaimer on every panel?
Per a December 2025 FDA letter, FDA intends to exercise enforcement discretion on the "each panel" requirement and may propose removing it. But it is not relaxing the core rules: the disclaimer must still be on the label and linked to each claim. Keep it and link it to each claim.
7. Do I have to notify FDA of my claims?
Yes — for structure/function (and general well-being and classical nutrient-deficiency) claims, submit the claim text to FDA within 30 days of first marketing. It's a notification, not approval; substantiation stays your responsibility.
8. What must the Supplement Facts panel include?
Supplements use a Supplement Facts panel (101.36), not Nutrition Facts — serving size, dietary ingredients and amounts per serving, and % Daily Value where established, in the required format. Format and accuracy errors are commonly cited.
9. Does my product have to say "dietary supplement"?
Yes. The statement of identity must include "dietary supplement" (or a descriptor like "herbal supplement"). Not identifying the product clearly is a violation.
10. How must ingredients be disclosed?
Dietary ingredients go in the Supplement Facts panel; fillers, binders, and flavorings go in an "Other ingredients" statement. Omitting ingredients — especially an allergen source — is a frequent failure.
11. Do allergen rules apply to supplements?
Yes — FALCPA applies. Declare the source of each of the 9 major allergens where present, including sesame (required since Jan 1, 2023). Undeclared allergens are high-risk.
12. Do I need a U.S. responsible firm?
Yes. The label must show the manufacturer, packer, or distributor's name and place of business. For imports, a U.S. responsible firm should be identified.
13. Can labeling errors alone trigger a letter if the product is safe?
Yes. A safe product can still be misbranded because of its label or claims — misbranding is a leading basis for supplement enforcement and needs no safety problem.
14. Are FDA warning letters public?
Yes — FDA posts them publicly, so customers, competitors, retailers, and partners can find them. That visibility is a big part of the damage.
15. How quickly must I respond?
Typically within 15 working days, with corrective actions and timelines. Prompt, complete responses matter, since failing to correct can escalate enforcement.
16. What if I ignore a warning letter?
It can escalate to product seizure, an injunction, and import refusal. Continuing to sell the non-compliant product without correcting it raises the risk.
17. Can Amazon remove my product?
Yes. Marketplaces often delist products under FDA enforcement or with non-compliant claims, and a public warning letter can prompt removal — compounding the impact.
18. Do website and social media claims count?
Yes. FDA treats them as part of the product's labeling. A compliant bottle with disease claims online can still trigger a letter, so keep claims consistent and compliant everywhere.
19. How do I prevent a warning letter?
Review the label and all marketing before production: substantiated structure/function claims only, DSHEA disclaimer added and notified, verified Supplement Facts and identity, complete ingredient and allergen disclosure, and the responsible firm. A pre-market review is the best safeguard.
20. Is a professional label review necessary?
Strongly recommended. The highest-risk issues — a claim reading as a disease claim, a mis-linked disclaimer, a hidden allergen — are easy to miss and exactly what a review catches before the product is public.
21. How does FDA Registration Assistance help?
It reviews your supplement label and marketing against the structure/function line, verifies the DSHEA disclaimer and notifications, corrects the Supplement Facts panel, and confirms ingredient, allergen, and responsible-firm disclosure — returning clear corrections before you produce or sell.
22. How do I get my supplement label reviewed?
Contact FDA Registration Assistance at info@fdaregistrationassistance.com or call +1 (928) 275-8333. Send your label artwork, formulation, and intended claims across label and marketing for review before market.
