If you run a brand that uses influencers, your world just got a lot more complicated.

In June 2026, a massive class-action lawsuit hit the fitness giant Gymshark. The case, Lupea v. Gymshark USA, Inc., filed in the Southern District of New York (SDNY), alleges that the brand systematically used an “army” of influencers to sell products without properly disclosing that they were paid to do so.

For Facebook advertisers and business owners, this isn’t just “fitness industry drama.” It is a legal warning shot. If you are paying people to talk about your products: whether you’re giving them cash, free gear, or affiliate commissions: and they aren’t disclosing it correctly, your brand is the one on the hook.

At the Law Office of Craig D. Carson PLLC, we help businesses navigate the intersection of advertising and the law. Here is the breakdown of what happened with Gymshark and, more importantly, how you can protect your business from a similar fate.

What Happened in Lupea v. Gymshark?

The lawsuit centers on Mihaela Lupea, a consumer who claims she bought Gymshark leggings after seeing endorsements from major fitness influencers like Whitney Simmons and Annabel Lucinda. According to the filing (Case 1:26-cv-05073), Gymshark allegedly encouraged its influencers to post content that looked “organic” but was actually a paid advertisement.

The problem? The disclosures were either missing entirely or “buried.”

In many cases, the #ad or #sponsored hashtags were hidden behind the “see more” cutoff on Instagram or TikTok, or lost in a sea of thirty other hashtags. The lawsuit argues that because these disclosures weren’t “clear and conspicuous,” consumers were misled into thinking these were unbiased, personal recommendations rather than paid pitches.

The Legal Trap: Why “Hidden” Disclosures Don’t Work

The Gymshark lawsuit isn’t just about bad manners; it’s based on two very specific legal frameworks that every Facebook advertiser needs to know.

1. The FTC Endorsement Guides

The Federal Trade Commission (FTC) has been tightening its grip on influencer marketing for years. The FTC Endorsement Guides are the “gold standard” for what is legal.

The latest updates make one thing clear: Disclosure must be unavoidable. If a consumer has to click “more,” scroll down, or look past a dozen other hashtags to see that a post is an ad, you have likely violated the law. The FTC requires that a “material connection” (any benefit like money, free products, or even a family relationship) be disclosed in a way that is “clear and conspicuous.”

2. New York General Business Law § 349

Because this case was filed in New York, it leans heavily on NY GBL § 349, which prohibits deceptive acts and practices. Under this law, a plaintiff doesn’t necessarily have to prove that your product was defective. They just have to prove that your marketing was misleading and that it caused them “injury.”

The “Price Premium” Theory: Why This Could Cost You Millions

One of the most dangerous parts of the Gymshark lawsuit is the use of the “Price Premium” theory.

The plaintiff, Lupea, isn’t saying the leggings were bad. She is saying that because the endorsements seemed “real” and unbiased, Gymshark was able to charge a higher price than the product was actually worth.

Think about it this way:

• The Theory: A product endorsed by an “unbiased” expert is perceived as more valuable than a product in a standard commercial.
• The Harm: By hiding the paid nature of the endorsement, the brand artificially inflates the value of the product.
• The Damages: Consumers are suing for the difference between the “premium” price they paid and the “true value” of the product without the deceptive marketing.

When you multiply that “price premium” by every person who bought your product over several years, the numbers become catastrophic for a small or mid-sized business.

How to Protect Your Brand: 5 Actionable Steps

You don’t need to stop using influencers, but you do need to stop being sloppy. Here is your compliance checklist to avoid the “Gymshark trap.”

1. Put #Ad at the Top

Don’t bury it. Don’t hide it in a “comment.” The disclosure should be in the first few lines of the caption, before any “read more” cutoff. It should be impossible for a user to consume the endorsement without seeing the disclosure.

2. Monitor Your Influencers (It’s Your Job)

You cannot just “set it and forget it.” The FTC and New York courts hold the brand responsible for what the influencer does. You should have a system in place to review every post your influencers make. If they forget the #ad, you need to have them fix it immediately.

3. Tighten Your Contracts

Your influencer contracts should explicitly state that they MUST follow FTC guidelines. Include specific examples of where the disclosure should go and what words to use. If an influencer refuses to disclose, you need to have the contractual right to terminate the relationship without pay.

4. Train Your Team

If you have a social media manager or an agency running your Facebook ads, ensure they are up to speed on the 2023 FTC updates. “I didn’t know” is not a valid legal defense.

5. Document Your Efforts

Keep records of your influencer guidelines, your communications with them, and your monitoring logs. If you ever are sued, showing that you made a good-faith effort to enforce disclosure rules can be a powerful shield.

Final Thoughts from Law Office of Craig D. Carson PLLC

The Gymshark lawsuit is a reminder that the “Wild West” era of influencer marketing is over. Whether you are a massive apparel brand or a local business running Facebook ads, the rules of transparency apply to you.

Deceptive marketing isn’t just a PR risk: it’s a massive financial liability. By being proactive and ensuring your influencers are as transparent as possible, you aren’t just following the law; you are building long-term trust with your customers.

If you are worried about your current influencer agreements or need a review of your marketing compliance, reach out to the Law Office of Craig D. Carson PLLC. We help advertisers stay out of the courtroom so they can stay focused on growth.

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