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Another such example is Metformin , which is a medication for type 2 diabetes, which can also interfere with B12 absorption in the gut
Research indicates it's approximately three times more potent than native IGF-1 with a half-life of about 20 to 30 hours

Puori Pure Energy B-Complex : If you're looking for a B complex vitamin, this would be among my top picks

Proceedings (Baylor University