Probiotic Maker Apologizes for Intimidating Safety Critic

Lumina Probiotic makes a product designed to improve your teeth. It contains a strain of bacteria that naturally lives in your mouth and produces a substance that kills the bacteria responsible for cavities. It's a new kind of approach to dental health — not a mouthwash or paste, but a living colonizer you introduce to your teeth.

A blogger named Trevor Klee published a critical article about the product, raising safety questions about the bacteria producing a compound called mutacin-1140. Lumina's founder sent an angry email calling the post "defamatory." Then a contractor working with Lumina sent a follow-up email that explicitly threatened to sue for libel. Understandably, the blogger felt bullied and said so online.

Lumina is now responding: They say they never sued anyone, they apologize for the language used, and they want the public to know they actually encourage criticism. Since September 2023, they've paid "bug bounties" — cash prizes to anyone who raises a new, plausible safety concern about the product. Paying people to challenge you is a strange way to silence them, they point out.

Their science advisor and the company explain that mutacin-1140 is a natural compound already found in many people's mouths. All common strains of cavity-causing bacteria produce similar compounds. Still, the incident shows how quickly a small company's defensive response can look like an attempt to suppress free speech — and why it matters to keep health conversations transparent.