Magnesium L-threonate may have better cognitive than other formulations, but I wonder if a magnesium glycinate formulation would be better for anxiety/stress reduction.

Anectdotally also, I take Magnesium Bisglycinate from Thorne occasionally and it helps me relax and feel less anxious. My muscles stay pretty rigid normally and after taking the magnesium supplement I can feel everything loosen up. Helps with sleep too.