I stick to Controlled Labs Purple Wrath, it's a BCAA complex with a solid ingredient profile; it's not an NO product.
When I do want a pre-workout stim, I take CL's White Flood, I don't believe any of these NO products offer anything other than a stimulant effect and a placebo effect, but sometimes the preworkout pickmeup is nice.
These NO products are generally geared around the same things these days, a vitamin B complex, niacin, caffeine, and 1,3 dimethylamylamine or its derivatives.
Those, and arganine alpha ketoglutarate; but the research showing its effects as a vasodilator is kind of lacking in any meaningful sense; although there is some research suggesting it aids in protein absorption.
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