don't get b12 injections Shots at Home: How, Where & How Often to Inject Yourself Vitamin B12 Injections: The Key
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[DOI] [PMC free article] [PubMed] [Google Scholar] 17.Aksoy P, White TA, Thompson M, Chini EN

Hydroxocobalamin is safe to use during pregnancy and breastfeeding, with dosing generally following the standard schedule

Thankfully, the risk of B12 side effects is low
Cyanocobalamin Vitamin B12 Methylcobalamin Methylcobalamin is the purer, naturally occurring form of vitamin B12 that can be absorbed and used by the body immediately because it has a methyl donor attached to the cobalamin compound
Effects of moderate alcohol consumption on folate and vitamin B(12) status in postmenopausal women

It aids the utilization of fats in the body and supports weight loss