Anyone concernced about piperine? It's in a lot of supps (piperine/bioperine) - am I reading these studies right? In one of the studies piperine is shown to have 'in vivo anti-androgenic activity' and another 'decreased intratesticular testosterone'. However in the third it shows an increase in testosterone.
Anyone have any insight or opinions on this? Doc H included. In the one rat study a 10mg dose was used which caused seminal/testicular disturbance.
Effects of piperine on testis of albino rats. [J Ethnopharmacol. 1999] - PubMed - NCBI
Testosterone 5alpha-reductase inhibitory act... [Biol Pharm Bull. 2007] - PubMed - NCBI
Piperine, an active principle... [J Basic Clin Physiol Pharmacol. 2006] - PubMed - NCBI