RE: Worseing fatique
Posted Monday, January 14, 2013 at 5:07 PM
Always a good idea to check in with the health care professional(s) who know you best. Here's an assessment from our resident nurse practitioner and diabetes educator:
"Six weeks is the usual time frame [to notice a B12 boost], but I don’t know if that is evidence-based. Metformin does cause B12 deficiency (in 30% of people taking it was the most recent statistic I read), and it is recommended that anyone on metformin should be checked at least annually.
Fatigue can be caused by many factors. Easy to get a baseline B12 level before starting supplements. If B12 is normal, he’ll waste a lot of time [focusing on supplement] when he may need to treat something else."
Susan Levin, MS, RD
PCRM Director of Nutrition Education