>while science isn't saying you should use magnesium for sleep per se, it isn't necessarily a crazy idea

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.