You might want to try Magnesium Glycinate. Much kinder on the guts and easily absorbed in the system.
I buy Pure Encapsulations brand. I had to take large amounts of Mag after my bone marrow transplant. One of the meds I was on would deplete it from my system quickly. Other forms of magnesium really messed up my tummy and caused nasty surprises. 😳 So I checked with my team pharmacist and he okayed the Mag Glycinate. 4 years later, I still take 1 capsule daily by choice. I sleep well and it appears to be helping with bone density along with vit D and calcium supplements. My husband had restless leg syndrome and finally took my nagging suggestion to “Just give it a try!” and now he’s a daily user. It did help him. I hope you find relief.