JohnBM - Be aware of the labeling on this 400 mg product...
...."Bluebonnet's Magnesium 400 mg Capsules provide magnesium from
reacted magnesium aspartate. Available in easy-to-swallow vegetable capsules for maximum assimilation and absorption."
While you may tolerate this aspartate combination, be aware of the comments about consuming any forms of aspartate, Three amino acids..... glutamate, aspartate, and cysteine are known to be excitatory.
I certainly hope this product causes you no problem, but in case something does occur, be suspect of the aspartate form.
Be well,
Jackie