Can any of you suggest a good pre work out supplement?

My friend recommended GAT pre work out, says its awesome but when I looked it up it says 'hyperemia & TESTOSTERONE enhancing' so that obviously worried me and makes me think I can't take it, or else it will have bad side effects? I need something that will actually give my work outs a 10/10 and not always feel like a 8/10.

https://static1.squarespace.com/static/5235ea4de4b0bfcfa19c05b8/t/529a6e6ce4b0a5b6da076740/1385852525097/nitraflex.jpg

Can any of you suggest a good pre work out supplement?
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