NOT the same thing ...
AI Overview
Carnosic acid and carnosine are both antioxidants, but carnosic acid is a natural benzenediol abietane diterpene found in rosemary and sage, while carnosine is a dipeptide synthesized in the body from β-alanine and L-histidine.
Carnosine is produced in the liver ... carnosic acid is derived from plants ... rosemary and sage.