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SCORE
Iron
Deficiency · Fatigue · Anaemia
Tier 2 — Promising
What it is
Affects 1.62 billion people (WHO) — the most common nutritional deficiency globally. Critical: excess iron is toxic; always test ferritin before supplementing. Ferrous bisglycinate causes far less stomach upset than ferrous sulphate. Take with 50–100 mg vitamin C to boost absorption. Separate by at least 2 hours from antibiotics, thyroid meds, and calcium.
Efficacy
4/5
Safety
3/5
Research
4/5
Onset
2/5
Cost
4/5
Drug-int.
3/5
Dose
30–60 mg/day ferrous bisglycinate + vitamin C; test serum ferritin first; retest after 8–12 weeks
Time of day & tips
Take on an empty stomach with vitamin C for best absorption. Avoid dairy, tea, coffee, and calcium within 2 hours. Space 2 hours from antibiotics and thyroid medication.
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