Your body is not using all the proline available. Pinobanksin-3 (O) acetate is also known to stimulate the release serotonin, dopamine, and norepinephrine. This supplement improves your blood flow by relaxing your blood vessels. Nitric Oxide helps to expand blood vessels, which allows blood to flow easily to all areas of the body. If these vessels are clogged with plaque, optimal blood circulation in the penis takes a hit. It increases levels of nitric-oxide, which have a direct affect on your sexual function. Researchers at the University of Tampere, Finland, found that vitamin C could help improve erectile dysfunction. According to the makers of Boostaro, L-Citrulline shows similar effects to the blue pill but without side effects. Vitamin K2 is a powerful antioxidant that works by activating osteocalcin. Consuming a healthy amount of this vitamin reduces the risk of osteoporosis. L-lysine is required for the production and synthesis of collagen. L-lysine is also antiviral, in addition to its effect on testosterone. They end up exceeding the recommended dosage of a supplement which causes more harm than good.