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Erection is caused by the rush of blood in the tissue of penis, causing penis to become thicker, longer and harder. The holding capacity of penis tissue determines the sexual stamina and duration of erection. Moreover, potency and sexual stamina can also be positively influenced by specific amino acids. Zyflex stimulates the production of Nitric oxide which improves the circulation of oxygenated blood to the penis and help in erectile process. The rush of blood in penis tissue helps it to stand erect and last for the longer time giving you immense pleasure during sexual intercourse with your partner.