Best Supplements for Increased Hemoglobin Levels
Ranked by research evidence. Compare 28 supplements across 38 papers from the biomedical literature, with effect direction, evidence strength, and dose range for each.
Top picks by evidence
- 1IronModerate evidence5 studies
Across all 5 studies, 4 reported beneficial effects of iron supplementation on hemoglobin levels, with 4 reaching statistical significance. Effects were consistently small in magnitude. The median study duration was 58 days, and the most studied population was non-anaemic iron-deficient women of reproductive age. One meta-analysis in healthy blood donors used elemental iron at 7–105 mg/day.
Dose: 7–105 mg/day elemental iron (based on one meta-analysis); other studies reported doses as 4.4–55 mg/day or 0.2–112.8 mg/100 g food, with no clear convergence. - Low evidence3 studies
Across 3 studies, 2 reported beneficial effects of vitamin D supplementation on hemoglobin levels, with effect sizes ranging from small to moderate. The beneficial findings were statistically significant and primarily observed in clinical populations (children with inflammatory bowel disease and adults with extrapulmonary tuberculosis), with the median study duration of approximately 9 months (273 days). The evidence is mixed, with one neutral study in a pediatric clinical population, suggesting the effect may depend on baseline health status.
Product matchViva Naturals — Vitamin D3 with Organic Liquid Coconut Oil125 mcg · $15.16 · ★5.0 (208)
- ModerateIronAcross all 5 studies, 4 reported beneficial effects of iron supplementation on hemoglobin levels, with 4 reaching statistical significance. Effects were consistently small in magnitude. The median study duration was 58 days, and the most studied population was non-anaemic iron-deficient women of reproductive age. One meta-analysis in healthy blood donors used elemental iron at 7–105 mg/day. · Dose: 7–105 mg/day elemental iron (based on one meta-analysis); other studies reported doses as 4.4–55 mg/day or 0.2–112.8 mg/100 g food, with no clear convergence.4 beneficial1 neutral5 studies
- LowVitamin DAcross 3 studies, 2 reported beneficial effects of vitamin D supplementation on hemoglobin levels, with effect sizes ranging from small to moderate. The beneficial findings were statistically significant and primarily observed in clinical populations (children with inflammatory bowel disease and adults with extrapulmonary tuberculosis), with the median study duration of approximately 9 months (273 days). The evidence is mixed, with one neutral study in a pediatric clinical population, suggesting the effect may depend on baseline health status.2 beneficial1 neutral3 studies