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Mller TD, Blher M, Tschp MH, et al

Possible side effects are typically mild and temporary, including injection site reactions, occasional headaches, nausea, or lightheadedness, and a metallic taste in the mouth

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"Prevalence of folate and vitamin B12 deficiency in Mexican children aged 1 to 6 years in a population-based survey"

Most are not FDA-approved for human use, some exist only through a prescription or compounding pharmacy tied to a different condition, and the rest are sold exclusively as unregulated "research chemicals" not intended for human consumption