It is worth noting that these topical applications are quite controversial in the medical literature. The evidence supporting a dermal absorption of magnesium (

It is worth noting that these topical applications are quite controversial in the medical literature. The evidence supporting a dermal absorption of magnesium (or other electrolytes) is pretty poor [1]. [1] https://pmc.ncbi.nlm.nih.gov/articles/PMC5579607/ https://pmc.ncbi.nlm.nih.gov/articles/PMC5579607/