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Description
It depends what type of wrong youre talking about

Desnutrin is a 54 kDa protein that contains an N-terminal patatin-like domain that is found in many plant acyl hydrolases and is characterized by a conserved serine in the G X S X G motif, an alpha/beta-hydrolase fold, a conserved aspartate belonging to the D X (G/A) motif, and a glycine-rich region (130)
Conversely, many fat burning compounds can sometimes make negative impacts on appetite or actually break down lean muscle mass
National Institute for Health and Care Excellence (NICE)

He continued to say that for people with B12 deficiency, parenteral supplementation (ie not through the mouth/digestive system) therefore is a useless and expensive treatment, and if you still want it the NHS should not pay for it, you should pay for it yourself