LiLash maker hid serum side effects behind 'cosmetic' label, a new class action lawsuit claims

On Aug. 31, 2026, California resident Sandra Meyers filed a class action lawsuit against Cosmetic Alchemy LLC, the Arizona company behind the LiLash and LiBrow serums, in the U.S. District Court for the Central District of California.

The complaint alleges the company sold the serums as cosmetics rather than drugs and omitted they contain a pharmacologically active ingredient tied to serious eye problems.

Meyers says she bought LiLash repeatedly between August 2022 and May 2024 and spent more than $100. She claims her most recent use caused discomfort, eye inflammation and swelling, and says she would not have bought the serum had the label disclosed the risks.

The product allegations

The complaint claims the key ingredient in both serums is dehydrolatanoprost, a prostaglandin analog in the same class of compounds as the active ingredient in Latisse. The Food and Drug Administration approved Latisse for eyelash growth in 2008, and it requires a prescription because of possible side effects, according to the proposed class action. Cosmetic Alchemy reportedly sells its serums for roughly $90 to $150 with no prescription required.

Cosmetic Alchemy's website says its serums are safe for sensitive skin, and its marketing represents them as safe for sensitive eyes and contact lens wearers, the complaint claims.

The filing alleges Cosmetic Alchemy lists dehydrolatanoprost second-to-last on the ingredient list, with no indication that it is a prostaglandin analog.

The European Commission's Scientific Committee on Consumer Safety reportedly called prostaglandin analogs "very potent pharmacologically active substances for which serious adverse effects after direct eye applications have been reported" and flagged dehydrolatanoprost for potential carcinogenicity and reproductive and developmental toxicity.

The undisclosed side effects reportedly include:


  • Blepharitis and meibomian gland dysfunction

  • Chronic dry eye, redness, swelling, pain and irritation

  • Macular edema, ocular inflammation and blurry vision

  • Iris color change

  • Hair growth outside the treated area

  • Lash and brow fallout

The legal claims

The lawsuit brings eight claims against Cosmetic Alchemy:


  • Consumer protection statutes in all 50 states, the District of Columbia and Puerto Rico

  • California Consumers Legal Remedies Act, a state law against misrepresenting a product

  • Fraud for both false statements and omitted facts

  • Negligent misrepresentation for careless false statements

  • Breach of express warranty over the safety promises in the marketing

  • Breach of implied warranty, which requires goods to work as intended

  • Negligence

  • Unjust enrichment, which applies when a company profits unfairly at someone else's expense

Meyers seeks class certification, damages, restitution, injunctive relief, disgorgement of profits and attorneys' fees.

What the case means for LiLash and LiBrow buyers

The complaint proposes a national class of everyone in the United States who paid for either serum plus a California subclass. The suit seeks economic damages rather than compensation for physical injuries.

Cosmetic Alchemy has not responded in court or admitted wrongdoing. There is no settlement and no claims process as of filing.