are there side effects of b12 injections What Shots? 5 Benefits and Why do I feel worse

Andersson, Emmanuel Shapira, Biochemical and clinical response to hydroxocobalamin versus cyanocobalamin treatment in patients with methylmalonic acidemia and homocystinuria (cblC), The Journal of Pediatrics, Volume 132, Issue 1, January 1998, Pages 121-124, ISSN 0022-3476, Okuda K, Yashima K, Kitazaki T, Takara I

5 Amino 1MQ is taken via oral capsules

No added fragrance, no essential oils (including rosemary, which is common in hair products but can be sensitising for some)

Intramuscular injections of B12 are administered during the first stage of the test, an hour after the patient takes an oral dose of radiolabeled vitamin B12