Hi Tessa
How very good to see your post!
The Natural Calm is a specialized ionic form of magnesium citrate and rapidly absorbed. It comes in a powder that one mixes with liquid (tastes good too)
We get ours at iherb.com as it is cheapest there. Sometimes vitaminshoppe.com and their stores have it on sale.
as long as one sticks to the recommended dose there are no side effects that I am aware of but too much will cause loose stools
He gets additional supplemental magnesium from his morning multi shake too (Jarrow MultiFood)
stay in touch Tessa
hope things are going very well for your son at college