Supplement?

If i eat a 10miligrams of magnesium powder everyday, will I die?
If I`m correct, humans necessitate 10 miligrams of Magnesium each hours of daylight.
I do not want to buy supplements which contains Magnesium and eat Magnesium powder instead. will it be treacherous? The RDA [Recommended Dietary Allowance] for Magnesium is 300-400mg/day. The UL [upper intake level] is 1000/ml per day. That money that you can safely help yourself to up to 1000 mg without the risk of toxicity.
So, help yourself to a powder or supplement if you want. My nutrition teacher would enjoy said, "Just eat foods beside magnesium". If you have a capably balanced diet, you wont own to worrie.