I recognized the author from another study where he claimed that he found a cure for atrial fibrillation. So I would take it with a grain of salt. Although there is obviously an effect of Magnesium on many important body functions, but the same is true for potassium or other minerals and amino acids. e.g. tryptophan against depression.

see:

https://www.ncbi.nlm.nih.gov/pubmed/16797868