b12 self injections video UK How I give myself a vitamin injection Vitamin B12 Dosages: Your GoodRx
Description
[3] Thiamine (vitamin B) is required for carbohydrate metabolism

Suggested dosage may be repeated at 1 to 2 week intervals, as indicated by condition and response

Prevalence of the metabolic syndrome among 40,698 Korean metropolitan subjects
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If you have not had low B12 confirmed, that check with your GP comes first