Summary: Excessive vitamin B12 intake rarely causes toxicity, but very high levels from supplements or injections may be associated with skin reactions such as acne-like eruptions, though serious adverse effects remain exceptionally uncommon
In adults, offlabel use aims to restore agerelated declines in GH output, though robust adult trial data are limited and dosing is extrapolated from pediatric and physiologic studies [2]
Hydroxocobalamin is a long-acting B12 used for deficiency with less frequent dosing
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Results vary by individual and by the peptides prescribed, and side effects are relatively uncommon and usually mild