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Older adults with food-cobalamin malabsorption , where the stomach acid needed to release B12 from food has dropped with age

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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

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People with Certain Medications: Long-term use of medications like proton pump inhibitors or metformin can interfere with B12 absorption, leading to a deficiency