how to get rid of acne after b12 injection Vitamin Deficiency and Your Skin: Signs, Symptoms & Solutions Vitamin B12 induced acneiform eruption
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Without it, your body produces cells that are too large and cannot function correctly (macrocytic anaemia)

And the formulation itself varies from pharmacy to pharmacy, with different concentrations, preservatives, and added compounds like B12 , glycine , or niacinamide

4.3 Contraindications Hypersensitivity to Vitamin B1, B6 and/or B12 or any of the excipients of NEUROBION AMPOULES (see section 6.1)

Int J Mol Sci 22:3487