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Iron

Useful when iron deficiency or low stores are confirmed; not a just-in-case supplement for plant-based diets.

Form

Ferrous bisglycinate, ferrous sulfate, ferrous fumarate, or clinician-recommended forms

Dose

Use only when labs or a clinician indicate a need; dose depends on ferritin, hemoglobin, symptoms, and tolerance.

When to take

Often taken away from calcium, tea, and coffee; vitamin C may improve absorption. Follow clinician guidance if prescribed.

Last reviewed

2026-06-27

Toxicity and cautions

Iron can accumulate and cause harm. Overdose is dangerous, especially for children, and some people should avoid supplemental iron.

Quality checks

Review ferritin, hemoglobin, transferrin saturation, serum iron, and TIBC before supplementing. Do not rely on fatigue alone.

Popular brands

Solgar Gentle Iron
NOW Iron
Thorne Iron Bisglycinate
Nature Made Iron
Doctor's Best High Absorption Iron

Related guide: read the full nutrition guide.

General information only

GreenFit provides general nutrition information only. It is not medical advice. For medical conditions, pregnancy, children, elderly people, eating disorders, kidney disease, diabetes, or medication-related concerns, consult a qualified doctor or registered dietitian.