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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
Symptoms of Low Vitamin B12 Levels You can tell if your vitamin B12 levels start to taper off or become low if you start feeling any of the following symptoms
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While manufacturers state its acceptable for unopened vials, we recommend refrigerating them upon arrival
