# Carnosine

Dietary antioxidant dipeptide; small memory benefits in elderly trials, mild if any.

- Page: https://peprank.xyz/peptides/carnosine
- Category: Focus & memory (Supplement)
- Also known as: L-carnosine; beta-alanyl-L-histidine
- Routes: Oral
- Sequence: AH (β-alanine, not L-alanine (β-alanyl-L-histidine))
- Safety tier: Strict: Clean · Balanced: Clean · Evidence only: Clean
- Risk axes (0 none to 3 severe): Seen harm 0, Mechanism 0, Data gap 1, Silent harm 0, Product 0
- Positive: 43% of 15 graded reports glowing or positive, shrunk toward the 49% all-report average by 8 reports' weight
- Rank: #17 of 23 supplements
- Graded reports: 15 (Glowing 1, Positive 5, Mixed 3, Nothing 3, Negative 3)
- Evidence: Human RCTs — Small; anserine/carnosine in elderly
- Access: Supplement
- Onset: Users who feel it report more energy on day one or two; memory and glycation effects in trials took 8-12 weeks.
- Lasts: Short: serum carnosinase clears oral carnosine within a few hours, so it is taken once or twice daily.
- Cost per month: ≈ €12–36 (at 0.5–1.5 g/day, MOLEQLAR at €0.80/g)
- Updated: 2026-10-30

## What users report

Little Reddit discussion (under 20 first-hand reports, against far more about zinc-L-carnosine, a gut product). About half report a clear benefit: daytime energy, steadier blood sugar after carb-heavy meals, or anti-aging use they are happy with. A fifth feel nothing. A steady minority react badly within days: head pressure, a 'stressed' or irritable brain, worse brain fog (histamine-sensitive and long-COVID users), insomnia even with a morning dose, or low mood after months.

**Effects:** mental energy, less afternoon fatigue (anecdotal); verbal fluency (anecdotal); possible small memory benefit in elderly (RCT)

**Downsides:** usually no noticeable effect; occasional overstimulation or anxiety (isolated)

**Caveat:** It is a food constituent (meat), sold as an ordinary supplement, and gets the cleanest safety profile here. Expect little subjective effect.

**Typical use:** 500-1500 mg/day oral (trials used 1 g anserine/carnosine 3:1).

**Getting it:** Over-the-counter L-carnosine capsules or powder; not zinc-L-carnosine, which is a stomach product.

**Stacked with:** Reduced glutathione or NAC (Pushed by Nootropics Depot staff to slow carnosinase breakdown so 500 mg goes further; one user ties the combination to low mood after long use.); Anserine (The 3:1 anserine/carnosine chicken-extract formula used in the Japanese memory trials.); Benfotiamine and alpha-lipoic acid (Common anti-glycation stack among diabetics and anti-aging users; the one diabetic who reported on it could not tell whether it helped.)

## Risk profile

- **Seen harm 0/3:** Small RCTs report no serious side effects, though one schizophrenia trial at 2 g/day had more unspecified adverse events (30% vs 14%); first-hand reports describe head pressure and irritability, none serious.
- **Mechanism 0/3:** A dipeptide eaten daily in meat and broken down by serum carnosinase; no pathway to serious harm is known.
- **Data gap 1/3:** A food constituent sold for decades as a supplement, with RCTs adding up to several hundred people, but no formal GRAS or EFSA safety assessment.
- **Silent harm 0/3:** Reported effects (overstimulation, head pressure) are felt within days and fade on stopping.
- **Product 0/3:** OTC L-carnosine capsules or powder.

## Top reports

- Glowing, energy, 500 mg/day: “Lately I have started using L-Carnosine (500mg per day). Immediate benefits I have seen are a substantial increase in mental energy/wakefulness. I don't feel fatigued at around 3pm anymore. My ability to articulate and express my thoughts have increased significantly.” — [r/Supplements](https://www.reddit.com/r/Supplements/comments/686vac/lcarnosine_gives_me_insane_energy_nootropic_and/)
- Positive, skin-hair, 1000 mg/day: “I've been taking 1,000 mg of carnosine daily ever since, and I don't intend to ever stop taking it. Obviously there are other things that come into play, and I don't know how much credit to give carnosine, but I really haven't aged.” — [r/over30skincare](https://www.reddit.com/r/over30skincare/comments/1l3yrnl/carnosine_prevents_aging_from_glycation_why_dont/)
- Positive, anxiety: “It works great anti-anxiety” — [r/Supplements](https://www.reddit.com/r/Supplements/comments/1pp02u8/l_carnosine/nwlssci/)
- Positive, metabolic, 500-2000 mg/day: “Helps me with bloodsugar, so high carb meals won't knock me out like before supplementation. Also, I lost more than 10 pounds of water retention.” — [r/Supplements](https://www.reddit.com/r/Supplements/comments/yv8f50/lcarnosine/iwkk3yb/)
- Positive, recovery: “I took that stack post long term amphetamine use and I believe it sped my recovery up compared to other times I've gone through amph withdrawal.” — [r/NootropicsDepot](https://www.reddit.com/r/NootropicsDepot/comments/18u5lv6/combination_of_carnosine_and_anserine_looks/kfjr2ii/)

## Cheapest in Europe

- [MOLEQLAR](https://moleqlar.com/products/carnosin-pulver) (DE): Carnosin Pulver 30 g, €24, €0.80/g
- [Supersmart](https://www.supersmart.com/fr/boutique/anti-age/carnosine-complement-0257) (LU): Carnosine 500 mg, 90 veg capsules, €72, €1.60/g

## Studies

- [Histidine-containing dipeptide supplementation improves delayed recall: a systematic review and meta-analysis](https://doi.org/10.1093/nutrit/nuad135) (meta-analysis, n=730, 2023): Across 10 RCTs of carnosine, anserine or beta-alanine, supplementation modestly improved delayed recall but no other cognitive domain.
- [Effect of anserine/carnosine supplementation on verbal episodic memory in elderly people (Hisatsune 2016)](https://ncbi.nlm.nih.gov/pmc/articles/PMC4927867/) (rct, 2016): 1 g/day anserine/carnosine (3:1) for 3 months preserved delayed verbal recall and brain perfusion versus placebo in elderly volunteers.
- [Double-blind, placebo-controlled study of L-carnosine supplementation in children with autistic spectrum disorders (Chez 2002)](https://pubmed.ncbi.nlm.nih.gov/12585724/) (rct, n=31, 2002): 800 mg/day for 8 weeks improved autism rating and receptive vocabulary scores versus placebo; never independently replicated.
- [Effects of carnosine supplementation on glucose metabolism: pilot clinical trial (de Courten 2016)](https://pubmed.ncbi.nlm.nih.gov/27040154/) (rct, n=30, 2016): 2 g/day for 12 weeks in overweight non-diabetic adults ended with lower fasting insulin and insulin resistance than placebo.
- [A preliminary, randomized, double-blind, placebo-controlled trial of L-carnosine to improve cognition in schizophrenia (Chengappa 2012)](https://pubmed.ncbi.nlm.nih.gov/23099060/) (rct, n=75, 2012): 2 g/day added to antipsychotics for 3 months improved set-shifting (executive function) but not symptoms or other cognitive measures.
- [Carnosine treatment for Gulf War illness: a randomized controlled trial (Baraniuk 2013)](https://pubmed.ncbi.nlm.nih.gov/23618477/) (rct, n=25, 2013): 1.5 g/day for 12 weeks improved a cognitive speed test (WAIS-R digit symbol) but not fatigue or pain.

## Sources

- [Hisatsune et al. 2016: anserine/carnosine and verbal episodic memory in elderly, RCT](https://ncbi.nlm.nih.gov/pmc/articles/PMC4927867/)
- [Szczesniak et al. 2014: anserine and carnosine supplementation in the elderly](https://pubmed.ncbi.nlm.nih.gov/24880197/)