L-Histidine
Amino Acid
Also known as: Histidine, His, L-Histidine HCl, L-Histidine Hydrochloride, Histidine HCl
B
Grade B💊 500-2000 mg daily🎯 8 primary uses🔗 3 synergies⚠️ Review warnings
Levels upFitness+50 pts
Overview
L-Histidine is an essential amino acid precursor to histamine and carnosine, involved in immune function, wound healing, and neurotransmission. Evidence for isolated supplementation in healthy adults is limited, though histidine is necessary for normal physiological function.
Primary Uses
Histamine precursorCarnosine synthesisImmune supportAntioxidant (via carnosine)Amino acid supplementationHistamine productionProtein synthesisImmune function support
Frequently Asked About L-Histidine
How much L-Histidine should I take?
The typical effective range is 500-2000 mg daily. Individual needs vary based on age, body weight, diet, and goals — start at the lower end and adjust based on response. Always consult a healthcare provider before starting a new supplement.
When is the best time to take L-Histidine?
With meals. Consistency matters more than perfect timing — pick a daily anchor (e.g. with breakfast or before bed) and stick with it.
Should I take L-Histidine with food?
With or without.
Does L-Histidine interact with medications?
Yes — known interactions include Antihistamines may interact. If you take any prescription medication, talk to your doctor or pharmacist before starting L-Histidine.
What does L-Histidine pair well with?
L-Histidine stacks well with Beta-alanine, Other EAAs, and Zinc — these combinations either improve absorption or work synergistically toward common goals.
Who should not take L-Histidine?
L-Histidine should be avoided or used with caution by people with Severe histamine intolerance. Pregnant or breastfeeding women should consult a healthcare provider before use.
What are the side effects of L-Histidine?
Most people tolerate L-Histidine well. The most commonly reported side effects are Well tolerated. Side effects are usually dose-dependent — lowering the dose often resolves them.
Dosage
Typical range
500-2000 mg daily
Timing
With meals
With food
With or without
Duration
Safe long-term
Special Populations
Those with histamine issues use caution
Research & Studies
Search the literature now
We haven’t curated landmark studies for L-Histidineyet — one-click into the primary literature here. PubMed (RCTs) is usually the highest-signal starting point.
Mechanism of Action
- • Decarboxylated to histamine
- • Combines with beta-alanine to form carnosine
- • Metal ion chelation
- • Important for hemoglobin structure
Evidence Quality
Evidence Grade B
Established physiological roles in multiple systems
Safety & Contraindications
Serious Warnings
- • May increase histamine in sensitive individuals
Contraindications
- • Severe histamine intolerance
Common Side Effects
- • Well tolerated
Pregnancy & Breastfeeding
Consult healthcare provider
Liver & Kidney Notes
Caution in kidney disease
Interactions
💊 Medications
- • Antihistamines may interact
🧪 Supplements
- • Beta-alanine for carnosine
🍽️ Food & Alcohol
- • Found in protein foods
Stacking & Synergies
Pairs Well With
Avoid Combining With
None significant
Best Goal Synergies
Immune supportAthletic performance (via carnosine)
Buying Guide
What to Look For
- • Pure L-histidine
Standardization Markers
L-form specified
Adulteration risk
Low
Practical Notes
- • Usually adequate from diet
- • Histamine-sensitive individuals use caution
Tags
amino acidsemi-essentialimmuneantioxidantamino-acidessentialhistamine-precursorcarnosine-componentprotein-synthesis
Top Products with L-Histidine
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Last reviewed: August 2026 by the Formulate Research Team. Sources cited above; methodology and scoring criteria published here.
Cite this page
Formulate Research Team. (2026, August). L-Histidine — Evidence-Based Supplement Guide. Formulate Supplement Encyclopedia. https://app.formulate-health.app/learning/supplements/l-histidine
Educational content based on published research and our scoring methodology. Not medical advice — consult a qualified healthcare provider before starting, stopping, or changing supplements, especially if you take medications, are pregnant, or have a medical condition.