Intrinsic factor binds to vitamin B12 so that you can absorb it into the blood
For weight loss, though, its key advantage is metabolic flexibility : it helps the body switch to burning fat stores and may reduce insulin resistance, attacking one root cause of weight gain
B12 helps convert one compound (homocysteine) into another (methionine), which the body uses to create materials necessary for repair and cellular signaling
Human studies have mainly focused on safety, how the body handles the peptide, and metabolic markers such as IGF-1 and glucose levels, but have not shown strong evidence of weight loss
Regarding safety, there's no clear winner between cyanocobalamin and methylcobalamin, the two most common forms of B12 supplements
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