Its not that they dont work.Just that you can have too much of a good thing.Your body is already producing natural pheremones so these are added on top of it which can be too much for some people if you go to far past normal levels and causes an overdose.This can bring about aggression or ghosting.Your none levels are usually tied to your testosterone levels so you tend to have higher levels of none when your younger or physically fit so you can overdose a lot easier,sometimes even with 1 spray.That being said,if you can find your sweet spot for the products.They work fine.Ammo is generally better accepted because it is buffered though,tuth comes off very sexually if you overdose and can be taken as creepy,instant jerk overdoses will make you act aggressive and your more likely to get aggression back to you.The pheremone androstenone gets explained pretty well in this link and why you have to be careful with dosage of it.