Iron
Evidence-based supplement. Browse evidence-based comparisons to find the best iron for your specific health goal.
- Pregnancy and breastfeeding: Consult your healthcare provider before taking this supplement during pregnancy or while nursing. The safety of supplemental doses beyond dietary intake has not been established in pregnant or lactating women.
- Blood thinners: If you take blood-thinning medications (e.g., warfarin, apixaban, rivaroxaban, clopidogrel, or high-dose aspirin), consult your healthcare provider BEFORE starting this supplement, as it may have additive antiplatelet or anticoagulant effects.
- Kidney disease: If you have chronic kidney disease (CKD) or any significant kidney impairment, consult your healthcare provider before taking this supplement. Some supplements can accumulate to dangerous levels when kidney function is reduced.
- Gout: Individuals with gout should consult their healthcare provider before starting this supplement. Certain supplements (e.g., collagen, fish oil, niacin) may affect uric acid levels or trigger flares in susceptible individuals.
- Important: This supplement is not a replacement for prescription medications. It is supportive for individuals with low baseline status, not a treatment for diagnosed conditions (anxiety disorders, insomnia, hypertension, osteoporosis, etc.). Do not stop or reduce any prescription without consulting your doctor.
What do you want iron to help with?
Evidence is outcome-specific. Start with the result you care about instead of treating one supplement grade as universal. Paths are ordered by the evidence labels already attached to the published guides.
GLP-1 Hair Loss Prevention
Low ferritin is the most correctable cause of GLP-1 hair shedding. Dietitian-reviewed guide to iron bisglycinate for adults on semaglutide or tirzepatide.
Hair Loss
Low ferritin causing hair shedding? We ranked the 3 best iron supplements for hair loss in 2026—reviewed by a registered dietitian.
Energy
Struggling with fatigue? We reviewed the best iron supplements for energy in 2026—ranked by form, bioavailability, testing, and value.
Iron Deficiency
Compare the best iron supplements for iron deficiency in 2026. Expert-reviewed ferrous bisglycinate vs gluconate vs whole food iron with dosing, safety & RCT
GLP-1 Fatigue & Low Energy
Iron deficiency is the most common nutritional cause of fatigue in GLP-1 users. We review the best iron supplements for Ozempic and Wegovy users in 2026.
What the evidence can support
These bands organize the labels already attached to published Atlas pages. They do not create a universal grade for the supplement or outcome.
Best supported
Human evidence is comparatively stronger for these published paths.
No published pilot path currently carries this label.
Useful, but incomplete
Human evidence exists, but certainty, population fit, or effect size remains limited.
Evidence is early
Treat these as uncertain or context-dependent rather than established uses.
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