I can attest, I use Xenadrine (Weight loss supplement) for years now, not everyday or anything just when I'm finding my focus waning. Xenadrine has caffeine/gre

I can attest, I use Xenadrine (Weight loss supplement) for years now, not everyday or anything just when I'm finding my focus waning. Xenadrine has caffeine/green tea, hydroxycitric acid, and some other weight loss related herbs, but the caffeine/l-theanine is what I feel, deliver on the focus/mental energy. I've tried other caffeine products and l-theanine alone, nothing had that great effect as Xenadrine did, I'm not sure if maybe one of the other ingredients is a nootropic either, could be, I imagine, or could just be the quantities. Coffee and normal caffeine doesn't do much for attention/focus for me... but I drink way too much soda..or did.. (weaning off)... About to do keto for a few months.