Carnosic Acid is a diterpene from rosemary that acts as a pro-electrophile: under oxidative conditions it oxidizes to carnosol, which then alkylates cysteine residues on Keap1, protein that normally sequesters Nrf2 in the cytoplasm. Keap1 modification releases Nrf2 to translocate to the nucleus, where it upregulates a battery of antioxidant and cytoprotective genes: glutathione synthesis enzymes, HO-1 (heme oxygenase-1), NQO1, thioredoxin. Importantly activation is conditional as it only fires in cells already under oxidative stress, making it self-limiting and CNS-selective in the context of neurological oxidative load. It also inhibits COX-2 and 5-LOX, reducing downstream neuroinflammation.
For Anabolism
Community consensus on NooTopics and adjacent circles recommends co-administration with ORG-43902. The ORG-43902 note covers that compound’s mechanism in detail (LHCGR agonism for HPTA support); Carnosic Acid’s role alongside it appears to be background neuroprotection and antioxidant support during a hormonal modulation context rather than a direct mechanistic pairing at the receptor level.