L-Carnosine

Carnosine · Beta-alanyl-L-histidine

Snapshot

Indications	Contraindications
Type 2 diabetes glycemic control^{1, 2} Depressive symptoms^{3, 4} Delayed recall⁵ Inflammatory and oxidative markers⁶ Gastric mucosal injury⁷ Oral mucositis⁷	Pregnancy or nursing⁸ Under age 18⁸

Carnosine (beta-alanyl-L-histidine) is a dipeptide of beta-alanine and histidine found in skeletal muscle and brain, acting through antioxidant, antiglycation, and metal-chelating activity^{9, 10}. Supplementation is used to counter oxidative and glycation stress, with uses that follow in glycemic control in type 2 diabetes^{1, 2}, adjunctive care of depressive symptoms⁴, and delayed recall. Zinc-L-carnosine, a separate complex, is used for gastrointestinal and oral mucosal protection.

A meta-analysis of randomized trials in children with autism spectrum disorder found no difference from placebo. Results remain inconclusive for senile cataracts, cardiovascular disease, and schizophrenia⁹. A 2026 randomized trial in prediabetes or well-controlled type 2 diabetes found modestly lower depressive symptom scores than placebo, with larger cohorts still needed¹¹. There are 501 products listing L-carnosine, nearly all capsules, sold as carnosine alone or as zinc-L-carnosine; see Form comparison.

Health Canada lists a caution to consult a healthcare practitioner before use in pregnancy or breastfeeding on three of five licensed single-ingredient products¹².

Last updated October 16, 2026. Read how we make monographs.

In the full monograph

64 sources, 48 studies

When to useThe situations practitioners use it for, each with the reason and the study behind it.
SafetyWho should avoid it, who needs extra care, and the side effects reported in studies.
InteractionsThe medicines and supplements it interacts with, the effect of each, and what labeling says to watch.
Protocol notesThe doses used in studies, how and when they were taken, and how the forms on the market compare.
How it worksWhat it is and how it works in the body, in plain terms.
Published studiesThe studies behind each use, popular claims checked against them, and trials still under way.
Word of mouthWhat patients and practitioners report online, kept separate from the clinical evidence.
Clinical perspectiveA closing read of where the evidence is solid, where it is thin, and what has not been studied.

Snapshot

In the full monograph

Sources