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alternative to b12 injection Best Vitamin Site: Administering B12 Shots Do You Need a Prescription
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DOI: 10.1158/1055-9965.EPI-17-1136 Morales-Gutierrez J et al, "Toxicity induced by multiple high doses of vitamin B 12 during pernicious anemia treatment: a case report." Clinical Toxicology, Feb

Inspect the solution to make sure you dont see any suspended debris
Give it time, address the other variables, and track how you feel over weeks not hours
Prepared formulations should be kept refrigerated and used within their stability window