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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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Zinc and Increased Hemoglobin Levels

Research synthesisLow evidenceModerate effect3 studies · 2 beneficial · 1 neutral · 0 harmful

Across 3 meta-analyses, 2 reported beneficial moderate-sized effects on hemoglobin levels in people with sickle cell disease and celiac disease, while 1 found no clear effect in people living with HIV on HAART. The evidence base is small, and doses were not consistently reported.

  • Studied populations: people with sickle cell disease and celiac disease

Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. One of the beneficial studies (celiac disease) examined micronutrient deficiencies rather than direct zinc supplementation effects, so its relevance to supplementation is indirect. The neutral study in HIV highlights population-specific variability. No doses or forms were reported in any study, limiting specificity.

Generated Jul 14, 2026
3 of 3 papers
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