I can second the opinion on Magnesium. Though, instead of magnesium L threonate, I used Magnesium malate. I have tried citrate and orotate forms and while they were both good, compared to malate the effect was mild. The malate form of magnesium had a better calming effect on the mind and muscles.
Will try L threonate next time and see how it works.
https://examine.com/supplements/magnesium/