The essential oil of evening primrose is manufactured by crushing the yellow blossom of the flower. The name comes from the characteristic opening of its flowers during the night. Evening primrose is the most suitable plant for premenstrual syndrome (PMS) and for period’s adjustment. Is a fact that the percentage of women who suffer from the negative effects of PMS is quite high and usually report that they suffer from pain, cramps, hot flashes, breast enlargement, headaches, skin changes and changes in mood. Moreover, an important role seems to be played by hormonal disorders and some neurotransmitters. Evening primrose’s essential oil has high concentrations of gamma-linolenic acid (GLA), which is part of the omega-6 fatty acids. This substance fights against the action of prolactin, which according to surveys is considered to be the reason why women have symptoms of premenstrual syndrome (PMS), symptoms faced with great success by essential primrose’s oil. Furthermore, this essential oil is beneficial for the skin and gives shine, smoothes wrinkles and rectifies dehydrated skin. For each use, the essential oil of evening primrose should be dissolved in a base oil, for example almond’s oil.