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why do i feel ill after b12 injection Common & Rare Side Effects of Vitamin Injections How Much Do B12 Injections
Description
Users who set realistic timelines (4 to 12 weeks for skin, 3 to 6 months for hair), document progress under consistent lighting, pair the protocol with daily SPF, and stick with a quality product almost always see meaningful change

They also have potentially serious side effects that require close monitoring by the doctor

Jun 2014;105(3):245-54

If you haven't done it already, I think it's a good idea to track down the local B12 deficiency guidelines used by your ICB (Integrated Care Board) in England (Health Boards in Wales/Scotland)