Supplement
Histidine is an amino acid the body uses to build proteins, including hemoglobin, and to make carnosine, a compound that helps buffer and protect muscle. Most interest centers on blood health, where small human studies suggested it may have improved iron status and iron absorption in iron-deficiency anemia, though the evidence is very limited. Much of the support comes from animal and lab work, and no large trials have tested it in people.
- Updated
- How we grade
- Best evidence
- Grade D
- Conditions studied
- 2
- Outcomes
- 4
- Graded outcomes
- 0004
Evidence by condition
- Strong
- Moderate
- Limited
- Very limited
| Grade | Outcome | Effect | Size | Studies | People | Studies list |
|---|---|---|---|---|---|---|
| Iron Status Limited human research suggests histidine supplementation may improve iron status and enhance iron absorption in iron-deficiency anemia. Biochemically, histidine is critical for hemoglobin structure and oxygen binding, and animal studies confirm its importance in hemoglobin synthesis. Evidence remains preliminary with no large controlled trials. | Improves (the measure goes up) | Small effect | ||||
| Hemoglobin Synthesis Animal studies demonstrate histidine is essential for hemoglobin synthesis, and histidine deficiency causes growth retardation. The imidazole side chain of histidine plays a critical structural role in hemoglobin's oxygen-binding capacity. Human supplementation data supporting improved hemoglobin levels is very limited. | Improves (the measure goes up) | Small effect |
General
| Grade | Outcome | Effect | Size | Studies | People | Studies list |
|---|---|---|---|---|---|---|
| Carnosine Levels In vitro studies confirm histidine is a direct precursor to carnosine (synthesized with beta-alanine), which serves as an intramuscular buffer and antioxidant. While the biochemical pathway is well-established, no controlled trials have specifically examined oral histidine supplementation for increasing muscle carnosine in humans. | Improves (the measure goes up) | Small effect |
| Grade | Outcome | Effect | Size | Studies | People | Studies list |
|---|---|---|---|---|---|---|
| Atopic Dermatitis Symptoms Limited human studies have explored histidine supplementation in atopic dermatitis, potentially related to its role in filaggrin production (a histidine-rich protein important for skin barrier function). Evidence is preliminary and insufficient for clinical recommendations. | Improves (the measure goes down) | Small effect |
Key findings
- Iron StatusImproves (the measure goes up)
- Hemoglobin SynthesisImproves (the measure goes up)
- Carnosine LevelsImproves (the measure goes up)
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Third-party tested Histidine products. The evidence above is limited, so read it before you buy.
- Grade D
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