Provexum so you can enjoy better and longer lasting sex naturally with the best herbal sex pills. These pills contain a number of proven herbs to improve sexual health so – lets take a look at how they work. There are two naturally occurring substances in the body which are needed by both the male and female sex for peak sexual health and the substances are – nitric oxide and testosterone. Nitric oxide is the natural substance which controls the amount of blood which can enter the sex organs and it’s a fact no man can get an erection when levels are low, women also require it for libido and sexual satisfaction. When it’s produced in the blood vessels of the Krygen XL organs, it allows them to increase in..