Are any of these energy supplements particularly harmful, especially to someone under

[johntarjon]

I have a vague knowledge of chemistry, but it's not too advanced so I can't tell if a lot of these chemicals, and mixture of chemicals, is harmful, especially to someone under 18. My brother wants to take one of the following supplements, and I don't know if I should advise against it or advocate it, so if someone could help me out, that would be great.