DoseRoutine

Note

Can you take Metformin ER and Vitamin B12 together?

Yes — but there is one thing worth knowing.

Metformin ER and Vitamin B12 can be taken together — there is one detail worth knowing first.

Why these two interact

Long-term metformin use is associated with reduced B12 absorption.

What to do about it

Monitor B12 annually; supplement if low.

Timing

No fixed separation window applies here. Keep the timing consistent day to day so any effect is easy to spot.

The two items in this pair

Metformin ER

Category:: medication
Typical timing:: bedtime
With food:: with_food
Half-life:: 17 h

Full Metformin ER page

Vitamin B12

Category:: vitamin
Typical timing:: morning
With food:: either

Full Vitamin B12 page

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.

Run the free interaction checker Browse all pairs

Frequently asked

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.