Moderate interactionModerateSeparate by 1h
Iron bisglycinate and Black tea: interaction, severity and spacing
Iron bisglycinate and Black tea interact because tannins in black tea form insoluble complexes with non-heme iron, cutting absorption by up to 60-70% at the same meal. Take them 1 hours apart. Moderate risk.
Last reviewed: 2026-09-20Reviewed by: StackingRight clinical review
The interaction in detail
| Pair | Iron bisglycinate and Black tea |
|---|---|
| Type | Food interaction |
| Severity | Moderate |
| Required spacing | 1 hours minimum |
| Onset | At the time of dosing |
Mechanism
Tannins in black tea form insoluble complexes with non-heme iron, cutting absorption by up to 60-70% at the same meal.
What to do
Leave at least 1 hour between iron and tea. Drink tea between meals rather than with them.
How to fit both into one day
Iron bisglycinate
morningempty stomach
Non-heme iron absorbs best on an empty stomach with vitamin C. Coffee, tea and calcium can halve absorption, so keep them two hours away.
Putting Iron bisglycinate in the morning and Black tea in the evening satisfies the 1-hour separation without disrupting either one's absorption window.