Iron
Also known as: ferrous sulfate, ferric iron, iron (III)-hydroxide polymaltose complex, IPC, elemental iron, Fe, ferrous bisglycinate, iron bisglycinate, ferrous fumarate, ferrous gluconate, carbonyl iron
Effective Dosage
100-105 mg elemental iron daily for deficiency treatment (based on study doses)
What the Science Says
Iron is an essential mineral your body needs for energy production, oxygen transport, and dozens of cellular processes. Clinical trials show that iron supplementation significantly reduces fatigue in iron-deficient women — even those who aren't yet anemic — and raises ferritin levels within 2 months. In children with iron deficiency and ADHD, adding iron to standard treatment improved symptom scores faster than medication alone, suggesting iron plays a role in brain neurotransmitter function.
What It Doesn't Do
Won't boost energy if you're not actually iron deficient — testing your levels first is essential. Iron from plant-based foods and supplements doesn't always raise blood iron levels even when intake looks high on paper. Not a treatment for fatigue caused by other conditions like thyroid problems or poor sleep. Won't prevent cancer or treat brain tumors.
Evidence-Based Benefits
Iron is an essential mineral that plays a crucial role in the formation of hemoglobin, which carries oxygen in the blood. It is also important for energy metabolism and immune function. Supplementation is particularly effective in treating iron deficiency anemia.
Strong EvidenceEffective at: 8-18 mg daily
Source: auto-research
Absorption & Bioavailability
Variable. Ferrous sulfate (FS) is significantly more effective than iron (III)-hydroxide polymaltose complex (IPC) — FS raised ferritin by 109% vs. 7% for IPC over 12 weeks. Iron from plant-based meat analogues did not translate to measurable changes in circulating iron status despite higher dietary intake, highlighting that food-form iron bioavailability can be poor.
Red Flags to Watch For
- Ferrous sulfate causes more gastrointestinal side effects (nausea, constipation, cramping) than gentler forms like IPC — 33% vs. 28% symptom rate in one trial
- Iron supplementation without confirmed deficiency is unnecessary and potentially harmful — excess iron can cause oxidative stress and has been linked to cancer cell growth in research contexts
- Plant-based diets may appear iron-rich but blood iron levels may not improve — bioavailability from fortified foods and plant sources is often poor
- Iron supplements can interact with medications and other minerals; always confirm deficiency via serum ferritin test before supplementing
- Infertility myths and food color changes from iron-fortified products cause unnecessary consumer concern — these are not evidence-based risks
Products Containing Iron
See how Iron is used in these analyzed products:
Target
Supplement
Ritual Essential for Women Prenatal Multivitamin
Supplement
Physician's Choice 15 Billion Probiotic
Supplement
Fairwaymarket
Supplement
Supreme Herbals Moringa Leaf Powder
Supplement
MegaFood Blood Builder Minis
Supplement
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-04-08