Vitamin B Complex Injections Vitamin B complex injections include eight B vitamins: B1, B2, B3, B5, B6, B7, B9, and B12
You are just adding more to the inefficient one
Drop one dose level every 4 weeks (for example, from 10mg to 7.5mg to 5mg to 2.5mg)
Additionally, some individuals taking Mounjaro may have pre-existing conditions that independently increase their risk of B12 deficiency, such as previous bariatric surgery or concurrent metformin use (the MHRA has highlighted that metformin can reduce vitamin B12 levels)
The 2026 Prohibited List, Section S2.2.3 (Growth hormone, its analogs and fragments)