BioStacks

Best Iron for Hair

Top 10 products ranked

Last reviewed May 2026

Clinical dose: 15–45 mg

Why Iron for Hair

Iron plays a important role in hair. Essential for oxygen transport via hemoglobin and energy production in mitochondria. Iron bisglycinate (Ferrochel) offers 2–4x higher bioavailability than ferrous sulfate with significantly less GI distress—it's the preferred supplemental form.

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

See full Hair research →