Efficacy of oral compared with intramuscular vitamin B-12 supplementation after Roux-en-Y gastric bypass: a randomized controlled trial
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If you ever feel worse after a B12 injection, the cause is most likely not the B12 itself, but some troublesome excipient
What lipotropic injections plausibly contribute is more modest and more defensible: correction of real deficiencies, a tolerable non-stimulant option for patients who cannot or will not take prescription weight loss medication, and a recurring touchpoint that keeps patients engaged with a supervised program
Subcutaneous Injection Methods Subcutaneous injections are another way to give Vitamin B12
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