Association between metformin dose and vitamin B12 deficiency in patients with type 2

It’s highly recommended too supplement b12 methylcobalamin

Methylcobalamin as it’s the most absorbed form

dosages depending on how much metformin you take

Each 500mg metformin tablet you will need
1000mcg of vitamin b12 Methylcobalamin

Low levels of vitamin b12 include
Pale skin
headaches
breathlessness
muscle spasm twitching
a lack of energy
Feeling faint
extreme tiredness
pins and needles (paraethesia)
a sore and red tongue
mouth ulcers
muscle weakness
disturbed vision
psychological problems, which may include depression and confusion
problems with memory, understanding and judgement

Link study on b12 metformin
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6867725/

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