The supplement labeling guide: what FDA actually requires

Supplement labeling is one of those topics where everyone has half the answer. Founders read three blog posts and a Reddit thread, then send us label artwork that's missing required elements, makes claims they can't substantiate, or formats the Supplement Facts panel wrong.

Here's the actual list of what FDA requires, what's optional, and what we see go wrong most often.

The eight required elements

Every U.S. dietary supplement label must include all of the following. Missing any one of them is a labeling violation under 21 CFR Part 101.

1. Statement of identity

The "what is this product" line. Must include the term "dietary supplement" (or a more specific equivalent like "calcium supplement"). Placement: principal display panel, prominent.

2. Net quantity of contents

How much is in the container. Capsules: count. Powders: weight. Liquids: fluid volume. Placement: lower 30% of the principal display panel.

3. Supplement Facts panel

This is the box. Required format with specific font sizes, bold rules, and ordering. Includes:

• Serving size and servings per container
• Each dietary ingredient with quantity per serving
• % Daily Value where established
• "Other ingredients" in descending order by weight (below the panel)

You cannot use the "Nutrition Facts" format here. They're different panels with different rules.

4. Ingredient list

Either inside the Supplement Facts panel (for dietary ingredients) or below it as "Other Ingredients" (for excipients, fillers, capsule shells, flow agents). Descending order by weight.

5. Allergen disclosure

If your product contains any of the FDA's nine major allergens (milk, eggs, fish, crustacean shellfish, tree nuts, peanuts, wheat, soybeans, sesame), it must be declared. Either inline in the ingredient list or as a separate "Contains:" statement.

6. Manufacturer or distributor information

Name, city, state, and zip code of the manufacturer, packer, or distributor. If you're the brand and a contract manufacturer makes the product, you can list yourself as the "distributed by" — but your address must be accurate and reachable.

7. Disclaimer for structure/function claims

If your label says anything about supporting a body function ("supports immune health," "promotes restful sleep"), you must include the FDA disclaimer:

"These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease."

8. Lot code & expiration / best-by date

Technically lot code is required by cGMP, expiration date is optional but heavily expected by retailers and customers. Most reputable manufacturers include both by default.

What you CAN say (structure/function claims)

Structure/function claims describe how a nutrient or ingredient affects normal body structure or function. They're allowed without FDA pre-approval, with the disclaimer above. Examples:

• "Supports cardiovascular health"
• "Promotes restful sleep"
• "Helps maintain healthy energy levels"
• "Supports immune function"

What you CANNOT say (disease claims)

Disease claims are anything implying your product treats, cures, prevents, or mitigates a specific disease or condition. These require FDA pre-approval as a drug — which is a different regulatory universe entirely. Examples to never use:

• "Cures diabetes"
• "Prevents Alzheimer's"
• "Treats anxiety"
• "Lowers blood pressure" (this is a borderline case — depends on context)
• "Anti-inflammatory" (often crosses the line, depending on context)

FDA's warning letter database is full of supplement brands that crossed this line. It's the single most common reason a brand gets a warning letter.

Common mistakes we catch every week

• Wrong serving size. Founders set serving size for the dose they want, not what the formula actually delivers safely.
• Missing "Other Ingredients." The capsule shell, magnesium stearate, microcrystalline cellulose — all of it has to be disclosed.
• Wrong % Daily Value. Either omitted where required or shown where no DV exists.
• Disclaimer too small. The structure/function disclaimer has a minimum font size — and it needs to actually be readable.
• Marketing copy that contradicts the label. Your website says "treats inflammation" — the label says "supports a healthy inflammatory response." FDA reads both.
• Country-of-origin missing. "Made in USA" claims have specific FTC requirements — don't claim it if 40% of your raws are imported.

How to actually do this right

Three things will save you a labeling headache:

1. Have your manufacturer review your label artwork before print. We do this for every brand partner — it's part of the job.
2. Hire a regulatory consultant for SKU #1. A few hundred dollars up front is much cheaper than reprinting 10,000 labels.
3. Audit your marketing copy against your label. Everything you say about the product — on your website, in ads, on social media — should be consistent with what's on the label.

The FDA isn't trying to trap you. The rules exist so customers can trust what's in the bottle. Brands that take labeling seriously build more customer trust — and avoid the warning letters that derail growth.

Need a label review?

Every brand we manufacture for gets a free pre-print label review. If you're working with another manufacturer (or doing it yourself), we're happy to take a look anyway — drop us a line.

Send us your label

Disclaimer: this guide is educational and not legal advice. FDA regulations evolve. Always verify current requirements with your manufacturer or a regulatory consultant before printing labels.