Do they say how much magnesium you need? I take liquid calcium/magnesium every night, one tablespoon. It has 300 mg magnesium. I’m a very small person, so I’m sure that’s enough.
Also eat some, but not all of the natural sources listed on this thread.
Amount you need daily from Web MD. My doctor checks this site to see which supplements he’ll prescribe for me. He prescribes calcium and magnesium.
https://www.webmd.com/diet/supplement-guide-magnesium#091e9c5e801b5705-1-4
The muscles contain magnesium. Consuming less magnesium than you need would cause a muscle deficiency.
If you don’t have a muscle deficiency, you probably consume the magnesium you need. Grains, pineapples and bananas are high in magnesium.
If your muscles are normal and consuming more does not give you a benefit, you probably were consuming an optimal amoumt.