Can NOW Supplements NOW Supplements Magtein Help with Pots?

Bought this to see if it helps with my chronic migraines, since magnesium relaxes muscles and blood vessels. It definitely does that - I sometimes get low blood pressure (pots - a recurrent health issue) if I take it with other forms of easy absorb magnesium and/or muscle relaxers. It's now part of my migraine protocol. Wish it wasn't as expensive, but I've tried everything, and this is one of the few things to help