Carnosine
Endogenous Dipeptide / Dietary SupplementsupplementAlso known as: L-Carnosine, Beta-Alanyl-L-Histidine, Karnozin
A naturally occurring dipeptide of beta-alanine and histidine found in high concentrations in muscle and brain tissue, with antioxidant, anti-glycation, and anti-aging properties.
Overview
Carnosine (β-alanyl-L-histidine) is a dipeptide synthesized by the enzyme carnosine synthase, found in high concentrations in skeletal muscle, heart, and brain tissue. It serves as an intracellular buffer, antioxidant, and anti-glycation agent. Carnosine's pH buffering capacity in muscle helps delay fatigue during high-intensity exercise. Its anti-glycation properties prevent the formation of advanced glycation end-products (AGEs), which are implicated in aging, diabetes complications, and neurodegeneration. Carnosine levels decline with age, leading to interest in supplementation for anti-aging and neuroprotection. It is widely available as a dietary supplement, though oral bioavailability is limited by the enzyme carnosinase in blood plasma. L-carnosine and its derivatives (N-acetylcarnosine for eye drops) are popular in the longevity community.
Mechanism of Action
Carnosine exerts multiple protective effects: (1) Buffers intracellular pH in muscle, delaying acid accumulation during high-intensity exercise; (2) Scavenges reactive oxygen species (ROS) and reactive nitrogen species; (3) Chelates divalent metal ions (zinc, copper, iron) preventing Fenton chemistry; (4) Inhibits protein glycation and cross-linking by quenching reactive carbonyl species and AGE precursors; (5) Protects against lipid peroxidation; (6) May modulate neurotransmitter function through histidine-related pathways; (7) Activates Nrf2 antioxidant response element pathway.
Molecular Formula
C9H14N4O3
Molecular Weight
226.23 g/mol
Sequence
β-Ala-His
Dosage Protocols
Dose Range
500mg – 2000mg
Frequency
Once to twice daily
Route
oral
Cycle Length
Ongoing
Typical supplement doses are 500-1000mg daily. Higher doses may be needed due to plasma carnosinase degradation. Take on empty stomach for better absorption.
Source: Supplement protocols and clinical studies
🧮 Personalized Dosage Calculator
💰 Estimated Pricing
Typical Supply
500mg capsules, 60ct
Last Updated
2026-02
Widely available OTC supplement (L-carnosine). Very affordable. Also available as zinc-carnosine (Pepzin GI).
⚠️ Prices are estimates based on publicly available data and may vary significantly by vendor, location, and prescription status. This is not medical or financial advice.
Side Effects
| Effect | Severity |
|---|---|
| Tingling / Paresthesia | mild |
| GI discomfort | mild |
| Headache | mild |
Pros & Cons
Multi-modal anti-aging properties: antioxidant, anti-glycation, pH buffering, and metal chelation
Excellent safety profile with minimal side effects even at high doses
Widely available as an affordable dietary supplement
Naturally occurring in food (meat, fish) with long history of dietary exposure
Rapidly degraded by plasma carnosinase, limiting oral bioavailability and tissue delivery
Beta-alanine is more effective at raising muscle carnosine levels than carnosine itself
Human clinical evidence for anti-aging benefits remains limited
Research Studies
🩸 Blood Work
No specific bloodwork requirements reported for this peptide. General health panels are always recommended before starting any peptide protocol.
Legal Status
Available as an over-the-counter dietary supplement worldwide. Generally Recognized as Safe (GRAS). Not FDA-approved for any medical indication. N-acetylcarnosine eye drops available OTC.
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