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Metformin, a drug used to treat type 2 diabetes, can also decrease absorption of B12 in the small intestine of 10 percent to 30 percent of patients

And this month it landed in front of the FDA, where an advisory panel voted to make it easier to get overruling the agency's own scientists, who said the evidence simply isn't there [2]

In the short term, insufficient B-12 levels can trigger deep fatigue, mood fluctuations, and cognitive changes resembling dementia, hindering your vitality and optimal performance

Huberman emphasizes the importance of sourcing peptides from reputable providers, as the market is rife with dubious products