Non-GMO Triple Magnesium Complex (90 Capsules,300mg)

What's the percentage of each magnesium type in an individual serving? It's not listed on the label and it should be.

Question for the seller: What percentage of each type of magnesium is in this formula? I've seen others ask but the seller never responds to those.

Is this product produced in the USA?

What are the types of magnesium in this?