A naturally occurring dipeptide with anti-glycation, antioxidant, and anti-aging properties found in muscle and brain tissue.
Carnosine (ฮฒ-alanyl-L-histidine) is a naturally occurring dipeptide found at high concentrations in skeletal muscle, cardiac muscle, and brain tissue. It functions as a pH buffer, antioxidant, anti-glycation agent, and metal ion chelator. Carnosine levels decline with age, and supplementation has been studied for anti-aging, cognitive, and exercise performance benefits.
Carnosine's anti-glycation properties are particularly notable: it prevents the formation of advanced glycation end-products (AGEs) โ cross-linked proteins that accumulate with aging and contribute to skin aging, diabetes complications, and cardiovascular disease. By sacrificially reacting with sugars before they can cross-link proteins, carnosine protects structural proteins like collagen and elastin.
N-acetyl carnosine (NAC, not to be confused with N-acetyl cysteine) is a modified form used in eye drops for cataracts, based on research showing it can reduce lens opacity. Topical carnosine is used in anti-aging skincare for its anti-glycation and antioxidant effects.
Research demonstrates carnosine's anti-glycation effects in cell culture and animal studies. Oral carnosine supplementation improved cognitive function in elderly patients with mild cognitive impairment in a small RCT. Exercise performance benefits relate to its buffering capacity in muscle (reducing lactic acid effects).
N-acetyl carnosine eye drops showed modest improvement in visual acuity and lens clarity in studies of senile cataracts. However, ophthalmological societies have not endorsed this use due to limited evidence. Topical carnosine has demonstrated anti-aging effects on skin in several studies.
๐ Key Reference: PMID: 20865290 (carnosine anti-aging review), PMID: 21261547 (cognitive study)
Excellent safety profile as a dietary supplement. Well-tolerated orally. Topical use is non-irritating. NAC eye drops may cause mild stinging. Oral carnosine is rapidly degraded by carnosinase enzyme โ some protocols use sustained-release formulations. Consult your provider.
Available as dietary supplement (oral carnosine). Cosmetic ingredient (topical). N-acetyl carnosine eye drops are supplements, not FDA-approved drugs. Not regulated as a pharmaceutical.