Supplement

Histidine

L-histidine

Evidence TierCWADA NOT PROHIBITED

tuneTypical Dose

2

watchEffect Window

8-12 weeks for meaningful outcomes.

check_circleCompliance

WADA NOT PROHIBITED

Overview

Clinical Summary

Histidine is an essential amino acid with limited standalone supplement evidence, with the clearest human signal in insulin-resistance and inflammatory markers in obese women with metabolic syndrome.

Histidine matters biologically, but most supplementation claims overreach the human evidence. The strongest direct clinical trial found metabolic and inflammatory improvement in obese women with metabolic syndrome at 4 g/day for 12 weeks. Beyond that, the evidence becomes much thinner. Metabolomics studies support mechanism, and histidine-containing dipeptide trials suggest pathway plausibility for cognition, but those are not the same as proving standalone histidine improves cognition or performance.

Histidine is an essential amino acid that can affect histamine signaling, carnosine-related metabolism, and inflammatory status, but direct supplement evidence is strongest for selected metabolic outcomes rather than performance or cognition.

Outcomes

What This Is Expected To Influence

Primary Outcomes

  • Improved insulin-resistance and inflammatory-marker profile in a narrow metabolic-syndrome population
  • Mechanistic metabolomic shifts consistent with altered glucose and lipid handling

Secondary Outcomes

  • No reliable standalone cognition benefit established
  • Standalone performance support not established

Safety

Contraindications and Interactions

Contraindications

  • Severe renal impairment
  • Histamine sensitivity syndromes
  • Active severe GI disease

Side effects

  • Headache
  • Nausea
  • Histamine-like flushing/intolerance

Interactions

  • Antihistamine therapy
  • High-dose combined amino-acid stacks

Avoid if

  • Active mast-cell instability
  • Advanced kidney disease
  • Unstable chronic GI conditions

Evidence

Study-level References

histidine-SRC-001Randomized human trial
Sourceopen_in_new

Du S, Sun S, Liu L, Zhang Q, Guo F, Li C, Feng R, Sun C. Effects of Histidine Supplementation on Global Serum and Urine 1H NMR-based Metabolomics and Serum Amino Acid Profiles in Obese Women from a Randomized Controlled Study. J Proteome Res. 2017;16(6):2221-2230. doi:10.1021/acs.jproteome.7b00030. PMID:28447460.

Population: Obese women with metabolic syndrome.

Dose protocol: Histidine supplementation for 12 weeks in obese women with metabolic syndrome, with metabolomics measured in nested subsets

Key findings: Histidine changed serum and urine metabolomic signatures in ways consistent with altered amino-acid, lipid, and glucose handling.

Notes: Mechanistic companion study rather than the primary clinical-outcomes trial.

Paper content

This paper does not show satiety improvement. It is a mechanistic companion study showing that histidine supplementation in obese women with metabolic syndrome shifts metabolomic and amino-acid profiles in directions broadly consistent with improved glucose and lipid handling. It is useful for mechanism support, not as a primary clinical efficacy anchor.

histidine-SRC-002Meta-analysis
Sourceopen_in_new

Bell SM, Hariharan R, Laud PJ, Majid A, de Courten B. Histidine-containing dipeptide supplementation improves delayed recall. A systematic review and meta-analysis. Nutr Rev. 2024;82(10):1372-1385. doi:10.1093/nutrit/nuad135. PMID:38013229.

Population: Participants enrolled in randomized controlled trials of histidine-containing dipeptides such as carnosine and anserine.

Dose protocol: Aggregated histidine-containing interventions

Key findings: Delayed recall improved in pooled histidine-containing dipeptide trials, but broader cognitive scales did not.

Notes: Not direct standalone histidine evidence.

Paper content

This is not direct histidine evidence. It pools trials of histidine-containing dipeptides such as carnosine and related compounds and finds a signal for delayed recall but not for broader cognitive scales. It can support pathway plausibility, but it should not be used as proof that standalone histidine supplementation improves cognition.

histidine-SRC-003Randomized double-blind placebo-controlled trial
Sourceopen_in_new

Feng RN, Niu YC, Sun XW, Li Q, Zhao C, Wang C, Guo FC, Sun CH, Li Y. Histidine supplementation improves insulin resistance through suppressed inflammation in obese women with the metabolic syndrome. A randomised controlled trial. Diabetologia. 2013;56(5):985-994. doi:10.1007/s00125-013-2839-7. PMID:23361591.

Population: Obese women with metabolic syndrome.

Dose protocol: Histidine 4 g/day for 12 weeks

Key findings: Improved HOMA-IR, adiposity, inflammatory markers, and oxidative-stress markers without reported side effects.

Notes: Best direct histidine efficacy trial, but population was limited to obese women with metabolic syndrome.

Paper content

This is the most important direct histidine trial in the file set. In obese women with metabolic syndrome, 4 g/day for 12 weeks improved insulin resistance, body-composition measures, inflammatory markers, and oxidative-stress markers without reported side effects. The population was narrow, but it provides genuine clinical support for a metabolic-adjunct framing.

histidine-SRC-004Review
Sourceopen_in_new

Thalacker-Mercer AE, Gheller ME. Benefits and Adverse Effects of Histidine Supplementation. J Nutr. 2020;150(Suppl 1):2588S-2592S. doi:10.1093/jn/nxaa229. PMID:33000165.

Population: Narrative review of human and mechanistic literature on histidine intake, supplementation benefits, and adverse effects.

Dose protocol: Review of doses around 4 to 4.5 g/day and high-intake safety above 24 g/day

Key findings: Summarized potential metabolic benefit at moderate doses and zinc-related tolerance concerns at very high intakes.

Notes: Useful for safety framing rather than as primary efficacy evidence.

Paper content

This review is useful as a safety and dose-context source. It argues that human benefits are most credible in metabolic and inflammatory settings at around 4 to 4.5 g/day, while also noting that high intakes above 24 g/day have been linked to zinc depletion and cognitive adverse effects. It is not itself a trial and should support framing rather than stand as primary efficacy evidence.

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