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Insider's takeaway The Institute of Medicine has not established a tolerable upper intake level of B12 because studies show no adverse health effects when taking excess levels of B12, either through food or supplements

This 28-day limit applies even if the expiration date is months away

Clinical research has generally demonstrated favorable tolerability, though individual responses vary

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A simple way to track your progress is to jot down a few notes each week

For individuals who want to avoid pharmaceuticals or who hit a plateau on diet/exercise alone, this peptide duo offers a hormone-boosting strategy to push past stubborn set points