Can you take Iron (ferrous bisglycinate) and Liothyronine together?
Yes, with care — this combination needs a precaution.
Iron (ferrous bisglycinate) and Liothyronine can be taken together, but the combination needs a precaution.
Why these two interactSources for why these two interact: Jumps to this entry in the sources and references list at the end of the page.
Minerals chelate T3 and reduce absorption.
Inferred from a shared mechanism, not documented for this specific pair. The same explanation is applied to other combinations that work the same way.
What to do about itSources for what to do about it: Jumps to this entry in the sources and references list at the end of the page.
Separate liothyronine and mineral supplements by at least 4 hours.
TimingSources for timing: Jumps to this entry in the sources and references list at the end of the page.
Separate Iron (ferrous bisglycinate) and Liothyronine by at least 4 hours. Taking them in the same window is what causes the issue, not taking them on the same day.
The two items in this pair
Iron (ferrous bisglycinate)
- Category:
- mineral
- Typical timing:
- morning
- With food:
- either
Liothyronine
- Category:
- medication
- Typical timing:
- morning
- With food:
- empty_stomach
- Half-life:
- 25 h
Check your whole routine, not just this pair
One pair rarely tells the whole story. DoseRoutine checks every combination in your stack at once — supplements, TRT, peptides, GLP-1s and prescriptions — and schedules the doses so timing conflicts like this one are handled automatically.
Frequently asked
Sources cited on this page
Specific documents referenced by the numbered markers above.
- Cytomel (liothyronine sodium) — FDA prescribing information(opens in a new tab)DailyMed — U.S. National Library of Medicine · dailymed.nlm.nih.gov/dailymed/drugInfo.cfm
- Levothyroxine interactions with food and dietary supplements — a systematic review(opens in a new tab)PubMed — National Library of Medicine · pubmed.ncbi.nlm.nih.gov/33801406/
Verify at
This assessment is mechanism-based. These publisher search links let you check it against the current evidence — they are not citations, so they are not numbered.
- PubMed: Iron (ferrous bisglycinate) + Liothyronine(publisher search, opens in a new tab)National Library of Medicine · publisher search
- DailyMed label: Iron (ferrous bisglycinate)(publisher search, opens in a new tab)U.S. National Library of Medicine · publisher search
- DailyMed label: Liothyronine(publisher search, opens in a new tab)U.S. National Library of Medicine · publisher search
- Cochrane Library(publisher search, opens in a new tab)Cochrane · publisher search
Related combinations
Educational information only, not medical advice. DoseRoutine does not diagnose or treat. Talk to your prescriber before starting, stopping or combining anything — especially if you take prescription medication or are pregnant or breastfeeding.