oh yeah.. you mention libido.. jack3d has an ingredient called geranium.. they have it as the scientific name in the ingredient profile.. (1,3-Dimethylamylamine or Methylhexamine)...its from a plant.. it gives you crazy clean energy.. and it lingers a few hours after you workout.. myself and a few other members have noticed during the duration of that last bit of energy, your libido is mildy suppressed.. but it doesnt have long term effects. just until the geranium wears off. but if you havnt tried pre workout stims.. i would go with another product.. like i said, no shotgun is probably number 1 in my opinion and theres an awesome deal on it right now. the ingredients are unparalleled.