If you've looked at more than one turmeric supplement, you've probably seen BioPerine listed as an ingredient. Here's what it's actually for.
Curcumin, turmeric's primary active compound, is poorly absorbed by the body on its own — much of it passes through without being taken up into the bloodstream.
BioPerine is a patented black pepper fruit extract standardized for piperine content. Piperine has been studied for its ability to increase the bioavailability of certain compounds, including curcumin, when taken together.
Pairing a turmeric extract with a bioavailability enhancer like BioPerine is a well-established formulation approach — it's a small addition with a specific, well-documented purpose.