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Great service It was easy to order but I cant tell a difference yet but its only been two weeks

"Proof of a causative effect of B12 supplements on acne development will require randomized control trials with enough subjects to see a significant effect, if one exists," he told Live Science

[15] Serious but infrequent events-such as angioedema, bronchospasm, hypotension, or urticaria-reflect IgE-mediated hypersensitivity and may require desensitization or substitution with hydroxocobalamin

However, if your deficiency is causing neurological symptoms, you may be given injections every other day for 1-2 weeks and then have regular injections every 2 months