Influencer marketing for supplement brands: what creators can and can't say

This is a plain-English summary, not legal advice. For anything on your label or in a campaign, check with a lawyer who handles FDA and FTC work.

Why it matters now

US supplement sales reached $72.88 billion in 2025, up 5.5%, according to Nutrition Business Journal, and 31% of people surveyed said social media and influencers were an important source of information. Women are the bigger market: in a Pew Research Center survey from July 2026, 82% of US women said they take a supplement, against 74% of men.

More creator content means more chances for a creator to say something your brand can't support. And under FTC rules, the brand is responsible for what its endorsers say.

Rule 1: structure/function, not disease

Under US law, supplements can make structure/function claims without FDA approval: statements about how a nutrient supports the body's normal structure or function. The FDA's own example is "calcium builds strong bones." A supplement can't claim to diagnose, treat, cure or prevent a disease. That's a drug claim.

When a label carries a structure/function claim, it needs the FDA disclaimer: "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." The brand also has to notify the FDA within 30 days of marketing with the claim.

Rule 2: the brand needs real evidence

The FTC's Health Products Compliance Guidance, issued in December 2022, says health claims need "competent and reliable scientific evidence," which in practice generally means randomized, controlled human trials. Animal studies, lab studies and anecdotes aren't enough on their own.

The same guidance is clear about influencers: an endorser can't make a claim the brand couldn't substantiate itself, and adding "results not typical" doesn't fix a misleading testimonial.

Rule 3: disclose every paid or gifted post

The FTC's rules for influencers require a clear disclosure of any financial connection, including free product. "Ad" or "sponsored" works. "Collab," "ambassador" or "sp" don't, and disclosures hidden behind "more" or among hashtags don't count.

The FTC enforces this. In November 2023 it sent warning letters to two trade groups and 12 dietitians and influencers over undisclosed paid posts about aspartame and sugar, citing penalties of up to $50,120 per violation. In April 2023 it sent notices to about 670 marketers of supplements and other health products, warning they could face the same penalties for unsupported claims or misleading endorsements.

Rule 4: know Instagram's own limits

Since 2019, Instagram has limited posts that promote weight-loss products with a price or purchase incentive to users 18 and over, and removes posts making "miraculous" diet or weight-loss claims tied to an offer like a discount code. Since 2022, creators can age-gate branded content, and weight loss is a restricted category. Meta's branded content policies change, so check the current version before a campaign.

The case everyone cites

In 2020 the FTC settled with Teami, a tea and skincare marketer promoted by Cardi B, Jordin Sparks and others. The FTC alleged unsupported weight-loss and health claims, plus influencer posts that hid the paid connection. The judgment was $15.2 million, suspended after a $1 million payment, and the FTC sent warning letters to ten influencers.

Why pinned comments are easier to keep compliant

In a sponsored Reel, the creator writes the script and the brand reviews it. In a pinned comment, the brand writes every word from its own account, and the creator just pins it. The same goes for the note on a repost of the brand's own Reel. You control the claim, so you can check it before it goes up.

For women's supplement brands, we write and check every comment with you before anything is posted. Here's how our campaigns work.