I use a magnesium oil spray on my skin every night. I can't say it helps blood sugars, or I haven't noticed if it does. It is supposed to help regulate irregular heart beats, help with energy levels, and with cramps. . An oil spray absorbs better than tablets. It does seem to help my energy levels, but hasn't done much for my ventricular ectopic heart beats. I don't know if I actually need a magnesium supplement because I eat a lot of the foods that contain it - meat, fish and dairy, but I use it anyway.