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Nor do they start from the same reserve levels

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

Supplementation was started with weekly intramuscular 1000 g vitamin B12 shots

That means your body can draw from these stores for years before you start to show signs of a deficiency

They do not show the weeks where nothing seemed to happen, the plateau at month two, the sudden drop at month three