The in-vitro caveat is the key issue here. The "100x" figure refers to inflammatory marker measurements in isolated mouse macrophage cell cultures, a setup where compounds are applied directly to cells at controlled concentrations. Oral supplementation involves digestion, absorption, metabolism, and distribution to tissues that make those in-vitro concentrations essentially unreachable.
Taking capsaicin and peppermint supplements together is unlikely to cause harm, but you're not replicating the study conditions. The in-vitro result is interesting as a mechanistic signal. It suggests a possible interaction pathway worth investigating, but it doesn't provide dosing guidance for humans.
This gap between study type and real-world applicability is exactly why I built vital-stack.com for supplement interactions in my database, I surface the study type and mechanism alongside the conclusion, so you can judge how much weight to give it.
Taking capsaicin and peppermint supplements together is unlikely to cause harm, but you're not replicating the study conditions. The in-vitro result is interesting as a mechanistic signal. It suggests a possible interaction pathway worth investigating, but it doesn't provide dosing guidance for humans.
This gap between study type and real-world applicability is exactly why I built vital-stack.com for supplement interactions in my database, I surface the study type and mechanism alongside the conclusion, so you can judge how much weight to give it.