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they're unregulated, potentially impure, and lack dosage precision, posing health risks like bacterial contamination or heavy metals.[44][45][46] Unregulated online sources amplify dangers with potential counterfeits, unknown additives, or legal violations, as they're not FDA-approved and may lead to adverse effects or inefficacy.[47][48][49] Prioritize compounding pharmacies for reliable, compliant options
Unlike with many of the other vitamins, B12 is not synthesized by the body
For bigger doses, like 2000 mcg, you need 2 mL
Some facilities may also provide compounding forms of some of these medications, all by licensed pharmacists
Read Less It is also involved in the metabolism of every cell in the body, particularly affecting DNA synthesis and regulation
