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Some people are prescribed B12 this way
[DOI] [PubMed] [Google Scholar] 22.Zhao H., Liu Y.-J., Liu Z.-R., Tang D.-D., Chen X.-W., Chen Y.-H., Zhou R.-N., Chen S.-Q., Niu H.-X

Zhou Y, Li L, Li S, Li S, Zhao M, Zhou Q et al (2019) Autoregenerative redox nanoparticles as an antioxidant and glycation inhibitor for palliation of diabetic cataracts

Always use a new needle: Never reuse a syringe or needle
