Magnesium, taken topically, is said to have better absorption into your body.  Best absorbed by spraying the bottom of your feet, however, this can be sprayed all over.  If you feel a tingly sensation it is said to be due to a lack of magnesium in your body.  Said to aid with improved sleep, anxiety, help to regulate hormones, improve muscle/joint pain, help to stop headaches and migraines. 
(As with anything you use, please consult your physician before use)
(Statements regarding this product have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease or health condition)