Carnosine
Summary
Carnosine is a dipeptide made of beta-alanine and histidine, concentrated in muscle. A meta-analysis of four small trials found lower HbA1c and a broader review of histidine dipeptides found smaller waists. A 14-week, 2 g/day trial in prediabetes and type 2 diabetes found no change in inflammatory markers.
Key facts
- A histidine-containing dipeptide made of beta-alanine and histidine[2]
- 4 RCTs (184 participants): HbA1c about 0.9 percentage points lower than control, with high heterogeneity[1]
- No significant change in cholesterol, fasting glucose or HOMA-IR in the same analysis[1]
- Histidine-containing dipeptides (23 pooled trials) were linked to about 3.5 cm smaller waist circumference[2]
- 2 g/day for 14 weeks did not change inflammatory markers in prediabetes or type 2 diabetes[3]
- 2 graded human outcomes on this page
- October 11, 2026
How it works
ProposedLaboratory studies suggest carnosine buffers acid, binds metals and limits sugar-driven protein damage (glycation); the relevance of these effects at supplement doses in people is not established.[3][2]
What the human research says
Human trials only, one row per outcome. The form column shows what each trial actually tested. Grades follow our evidence-grading policy.
At a glance: strongest evidence per outcome
| Outcome | Grade | Effect | Strongest evidence | Rows |
|---|---|---|---|---|
| Blood sugar | Grade C | Improved | Meta-analysis of 4 trials · n = 184 · 2020 | 1 row |
| Inflammation | No effect | No effect | RCT · n = 41 · 2024 | 1 row |
Every graded row
| Outcome | Effect | Grade | Best evidence | PMID |
|---|---|---|---|---|
| HbA1c | Improved | Grade C | Meta-analysis · n = 184 · 2020 Adults in 4 RCTs of at least 2 weeks Form: Carnosine · Dose: Varied across trials · Duration: At least 2 weeks HbA1c fell about 0.92 percentage points versus control (high heterogeneity, I² 69%); triglycerides, cholesterol, fasting glucose and HOMA-IR did not change significantly. | 31987255 (opens PubMed)Source [1] |
| Inflammatory markers and adipokines | No effect | No effect | RCT · n = 41 · 2024 Adults with prediabetes or well-controlled type 2 diabetes (completers) Form: Carnosine · Dose: 2 g/day · Duration: 14 weeks Changes in CRP, IL-6, TNF-α, adiponectin, leptin and other markers did not differ from placebo. | 39599686 (opens PubMed)Source [3] |
Forms
| Form | Elemental % | Absorption (human data) | GI tolerance | Studied for |
|---|---|---|---|---|
| L-carnosine | Varies | No head-to-head human absorption data in the sources cited here. | No form-specific tolerance data in the sources cited here. | Blood-sugar and inflammation trials |
Studied doses
Doses studied in human trials ranged from 2 g of carnosine per day for 14 weeks in the single trial cited here with a stated dose; the pooled trials used varied doses for at least 2 weeks.[3][1]
Interactions
Published interactions only: each row cites a source. No row means none was found in our sources, not that a combination is safe.
None found in our sources.
Who should be careful
- People on glucose-lowering medicines
- HbA1c fell in pooled trials, so glucose monitoring belongs with the prescriber if adding carnosine.[1]
- Pregnancy and breastfeeding
- Not studied in the trials cited here.[3]
Talk to your pharmacist or clinician before starting a supplement, especially if you take prescription medicines.
Where to buy Carnosine
Products from brands we partner with that contain Carnosine. Listing a product is not a claim that it works; check the amount per serving against the doses studied above, and the label for other ingredients.
- SupersmartPaid linkCarnosine3 capsules: 1,500 mg L-carnosine; 30 servings. That is below the 2 g/day used in the 14-week trial cited here.Shop at Supersmart (opens in new tab)Price and label checked 2026-10-11 on the brand’s site.
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Frequently asked questions
Does carnosine lower blood sugar?
A meta-analysis of 4 small trials found HbA1c about 0.9 points lower, with wide variation between trials.[1]
Is carnosine the same as beta-alanine?
No. Carnosine is a dipeptide of beta-alanine and histidine; beta-alanine is one of its building blocks and is sold separately.[2]
Does carnosine reduce inflammation?
In a 14-week trial at 2 g/day, inflammatory markers did not change versus placebo.[3]
Does carnosine help weight loss?
Histidine dipeptides were linked to a smaller waist in pooled trials, but fat-mass changes were not significant.[2]
Sources
- [1]Effect of carnosine supplementation on lipid profile, fasting blood glucose, HbA1C and insulin resistance: A systematic review and meta-analysis of long-term randomized controlled trials. Complement Ther Med, 2020. meta-analysis
- [2]Histidine-containing dipeptides reduce central obesity and improve glycaemic outcomes: A systematic review and meta-analysis of randomized controlled trials. Obes Rev, 2020. meta-analysis
- [3]Carnosine Supplementation Has No Effect on Inflammatory Markers in Adults with Prediabetes and Type 2 Diabetes: A Randomised Controlled Trial. Nutrients, 2024. RCT
What changed
- New monograph: definition, key facts, evidence table, studied doses, safety and FAQ written from the cited abstracts and fact sheets.
- Review: removed an unsourced "mostly in people with diabetes" qualifier and a meat-source claim.