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Iron supplementation for deficiency. Form matters enormously for absorption and side effects. We rank by bioavailability and tolerability data.
The best iron supplement available. Bisglycinate chelate form has strong clinical evidence for absorption and dramatically reduced GI side effects compared to ferrous sulfate. 25mg per capsule allows flexible dosing. NSF Certified for Sport.
Chelated iron (bisglycinate) at the RDA dose for premenopausal women. This form has significantly fewer GI side effects than ferrous sulfate. Only supplement if you have confirmed iron deficiency — excess iron is dangerous.
Ultra-cheap ferrous sulfate at therapeutic doses. Effective for iron repletion but the ferrous sulfate form causes significantly more GI side effects (constipation, nausea, cramping). USP-verified. Best for those who tolerate ferrous sulfate well and want maximum value.