In 1988 researchers found that L-arginine's vast-ranging health and fitness advantages had been due principally to its position as a precursor to nitric oxide. Other theories point out that it is usually harmful and may even cause negative side effects because phytoestrogens may displace the woman naturally produced hormones. But it's been debunked by other studies proving that phytoestrogens are not considered foreign objects by the body and therefore are thought to be comparable to the hormones naturally produced from the body. Moreover, it has been discovered that they displace mimic estrogens preventing the breast cancers cells to proliferate. It can also help alleviate problems with cancer of prostate, colon cancer and cardiovascular cancer. Human tests for Pueraria Mirificas as a food supplement product or as functional food, the merchandise have exhibited estrogenic effects. The effects of estrogenic activities include reforming of the epidermis which makes it firmer and younger, healthier hair and breast implant.