Stearic acid is a long-chain fatty acid abundant in the modern diet; it can be partially converted to the monounsaturated fat oleic acid. Unlike most other saturated fats, stearic acid doesn’t raise (and might even slightly lower!) LDL cholesterol levels, and has an overall neutral effect on most cardiovascular risk factors. It also acts as a signaling molecule affecting mitochondrial function and lipid oxidation, potentially giving it a protective role in nervous system diseases, muscular disorders, and even aging. It’s also demonstrated some anti-cancer activity, although more research is needed in humans.