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Generally well-tolerated
Biotechnol Adv 29(6):568574
Costford, S
Peptides for Energy and Stamina Some people notice improved energy within 2 to 4 weeks, but this depends on sleep, nutrition, stress, hormone balance, thyroid function, and metabolic health
Mol Neurodegener 2011
[11] Long-term metformin therapy reduces calcium-dependent intrinsic-factor binding, lowering B12 absorption and potentially necessitating higher or more frequent parenteral doses
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