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This product is intended strictly for use by qualified professionals in controlled research environments

But do they actually work

In a randomized, double-blind, placebo-controlled trial in 2,919 participants (65 years) with elevated blood concentrations of homocysteine, supplementation with vitamin B 12 (500 g/day) and folic acid (400 g/day) for two years did not decrease the risk of osteoporotic fracture despite reductions in homocysteine (120, 121)

Further studies are needed to determine whether other factors may also be involved

[1] For example, if a 2 mL dose (full 200 mg thiamine, 200 mg niacinamide) is to be given IV, a nurse might mix it into 50 mL of saline and infuse over 15-30 minutes

No, B12 injections are licensed medicines used to treat confirmed vitamin B12 deficiency, whilst lipotropic injections are unlicensed combinations marketed for weight loss without robust clinical evidence