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Amino Acid

N-Acetyl L-Carnosine

Also known as: NALC, N-Acetylcarnosine, acetyl-L-carnosine, NAC-carnosine

C
Evidence

N-Acetyl L-Carnosine is an acetylated form of the dipeptide carnosine that may support cellular health through antioxidant and anti-glycation mechanisms. Most research has focused on topical ophthalmic applications, with limited evidence for systemic oral supplementation in humans.

Primary uses

  • Cellular antioxidant support
  • Anti-aging support
  • Eye health (primarily topical research)
  • Protein glycation reduction

How it works

  • Antioxidant activity via free radical scavenging
  • Inhibition of advanced glycation end products (AGEs)
  • Potentially improved cellular carnosine uptake via acetylation

Dosage

Typical range
500-2000 mg daily (oral)
Timing
Divided doses with or without food
With food
May be taken with or without food; no strong evidence of food interaction
Duration
Long-term safety data limited; most studies examine 8-24 week durations
Special populations
Pregnant/nursing: insufficient data; diabetic individuals (theoretical benefit for glycation) lack confirmatory human trials

Forms

  • Powder· 70/100
  • Capsule· 70/100
  • Eye drops (pharmaceutical)· 70/100

Safety

Common side effects

  • Generally well-tolerated
  • Rare: gastrointestinal upset
  • Rare: allergic reactions (minimal reported incidence)

Contraindications

  • No major contraindications identified
  • Use with caution in individuals with carnosine metabolism disorders (rare)

Evidence notes

Most robust evidence exists for topical ophthalmic use (age-related cataracts, corneal health). Oral systemic research in humans is limited and preliminary. Animal studies suggest cellular benefits, but human RCT evidence for oral supplementation is sparse.

Grade C: Mostly observational or small trials; mechanism is plausible but unproven at scale.

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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider.