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B12 helps your body turn food into energy, so when your levels are low, your metabolism and your motivation both take a hit
Pharmacokinetic studies using radiolabeled versions of the peptide reveal rapid absorption after injection, with peak concentrations achieved within 3 to 6 minutes following intramuscular administration
That means you cant absorb enough vitamin B12 from food
Pharmaceutics, 17 (1), 119
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