Check before you startThis one has documented interactions with medication classes where the consequences are serious. If you take any prescription medicine, run it past a pharmacist before starting.
How long to take it
Temporary. Typically three to six months, then retest. Stop once ferritin is comfortably in range.
Who it's actually for
Only people with a confirmed low ferritin or a clear clinical reason. Never take iron speculatively.
Safe upper limit
Verified45 mg per day (elemental)
The body has no way to excrete excess iron. Overload damages the liver, heart, and pancreas — and haemochromatosis is common enough to matter.
40 mg for children 1–13, 45 mg for teens and adults 14+.
Interactions to know about
- Thyroid medication — Levothyroxine, carbimazole, methimazole
- Antibiotics — Especially tetracyclines and quinolones
- Acid blockers — Omeprazole, lansoprazole, famotidine
- Parkinson's medication — Levodopa / carbidopa
Other supplements:
Run your full list through the interaction check.
Practical notes
- Take with vitamin C; avoid tea, coffee, calcium and dairy within two hours.
- Alternate-day dosing is often absorbed better and is gentler on the gut.
- Bisglycinate causes less constipation than sulfate.