Overview
Conditionally essential amino acid for hemoglobin.
- Dietary protein from animal sources (meat, fish, eggs, dairy) and plant sources (soy, legumes, grains)
- Free-form amino acid powders and capsules
- Targeted pre-workout, recovery, or sleep formulations
- Free-form crystalline powder
- Capsules or tablets
- Pre-mixed recovery or hydration beverages
- Time-release formulations
Mechanism of action
Precursor to histamine and carnosine.
- · Precursor to histamine
- · carnosine
Effects on the body
Organ system effects
Evidence-based benefits
May reduce RA symptoms
Moderate evidencePotential side effects
- · GI upset
Drug interactions
Supplement interactions
- A high-quality multivitaminCovers micronutrient cofactors that support most supplement pathways.
- Omega-3 (EPA/DHA)Foundational anti-inflammatory support that complements most regimens.
No specific avoidances listed.
Dosing & bioavailability
Where to buy
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Third-party testedIndependently verified L-Histidine — look for USP, NSF, or Informed Sport seals on the label for purity and dose accuracy.L-Histidine third party tested NSF
CapsulesPre-measured L-Histidine capsules — easiest for travel and consistent daily dosing without scoops or scales.L-Histidine capsules
PowderBulk unflavored L-Histidine powder — best cost-per-gram and flexible dosing for stacking or mixing into drinks.L-Histidine powder unflavored
Best sellersMost-purchased L-Histidine products on Amazon — a quick way to see what's reviewed widely before you commit.L-Histidine best sellerScientific evidence8Show studiesHide studies
Histidine in rheumatoid arthritis
Pinals RS, et al.
45 RA patients
Modest improvement in grip strength.
PubMed: L-Histidine — May reduce RA symptoms
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PubMed: L-Histidine — randomized controlled trial
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PubMed: L-Histidine — dose response
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Google Scholar: L-Histidine — clinical evidence
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