Best for Hair
Best Iron for Hair
Top 3 products ranked · Reviewed May 2026 · 15–45 mg clinical dose
Why Iron for Hair
Iron plays a supporting role in hair. ⚠️ TEST FIRST: do NOT supplement iron without a documented deficiency. Check serum ferritin (and ideally transferrin saturation) before starting — unsupervised iron in non-deficient individuals causes iron overload, oxidative stress, and increased risk of cardiovascular and metabolic disease over time.
What dose to look for
Clinical studies typically use 15–45 mg of iron. 15-25 mg for prevention/maintenance, 25-45 mg for deficiency treatment. RDA is 8 mg (men) / 18 mg (premenopausal women). Bisglycinate forms effective at lower doses due to 2-4× bioavailability. Products below this range may not deliver meaningful results.
What form to look for
Avoid ferrous sulfate — common gi side effects. Avoid ferrous fumarate — significant gi side effects. Avoid ferrous gluconate — low elemental iron (12%). Look for iron bisglycinate (ferrochel) for better absorption.
What the research says
Iron has strong clinical evidence for hair benefits. Essential for oxygen transport via hemoglobin; bisglycinate form has 2-4x better absorption than ferrous sulfate Learn more
Clinical research on Iron
MODERATE — strong in deficient populations · 18–65 mg/day (when deficient)
- •Iron deficiency is one of the most common causes of hair loss, especially in women — low ferritin strongly associated with telogen effluvium
- •Supplementation restores hair growth when ferritin is low, but no benefit when levels are adequate
- •Dermatology guidelines recommend checking ferritin in all women presenting with diffuse hair loss