does a vitamin b12 injection hurt

Do others experience side effects from vitamin B12 supplements? https://static.wixstatic.com/media/65f68b_f2ed3c74e8b44030823886b22f5b5da1~mv2.jpg/v1/fit/w_500,h_500,q_90/file.jpg B12 deficiency Size:50ml peptide In a subset of individuals, similar to HL414, the expression level of PPA0693 after vitamin B12 supplementation is lower than in other individuals, resulting in further increased level of porphyrins produced and leading to acne development

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