After a botched free filler treatment at work left her bruised, swollen and ashamed, former Hollyoaks star Sarah Jayne Dunn is speaking out to warn others about the hidden dangers of injectables. Vitamin B12 Injections: What Is It, Does It Work, and Do You Need One? Do B12 shots actually work? Short answer YESfor the right people. Benefits may include: Increased energy Better focus Improved metabolism Especially helpful if you're deficient. If A woman from Hull who went for a Botox treatment ended up with lumps in her head after being injected with dermal fillers by mistake. Lisa Smith says she could have gone