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Capra ME, Biasucci G, Banderali G, et al

The main limitation of our meta-analysis is the small number of studies (together with small sample sizes) currently in the literature, with single studies only for the posterior cingulate cortex, the hippocampus, and the thalamus (none of which showed a difference in GSH levels between cases and controls)

There have been some studies linking the supplements with more muscle and less fat in people with normal levels of GH, but nothing definitive

No established upper limit exists for vitamin B12 intake in the UK, as confirmed by the Scientific Advisory Committee on Nutrition (SACN)