"Symptoms of magnesium deficiency include ... insomnia" and "57% of the US population does not meet the US RDA for dietary intake of magnesium."
I don't know what was in the video beyond its title, but the title is solidly inside the bounds of established science.
Magnesium deficiency may be a documented problem, with documented symptoms. Taking magnesium to correct it may have unfortunate side effects, due to other drugs that you're taking, or other conditions that you may have.
One of the patents on my ward was an OAP who had been taking a lot of Zinc which reacted with the meds he was on and it Totally shut down his Kidneys FFS.
or maybe you have a sample size of one?
You want to try risking total renal failure go ahead - or are you a pusher with no concern for your punters health.
Btw they put you on the transplant list way before you get to this point which this person did to himself.
taking nutritional supplements without any evidence that they accomplish anything useful and without a physician's advice is generally a bad idea (the default mode is not 'take until suggested otherwise' but 'only take if necessary'), and trying to make money off it by marketing them on youtube is even more miserable.
I'm very much in favour of youtube taking a proactive stance here. As a related note on nootropics, most of the products advertised under that label don't actually do anything at all. There's two very well known nootropics, caffeine and nicotine. So the next time someone tries to sell you weird nutrition supplements, just get a good old cup of coffee.