In one study, women with moderate to severe premenstrual syndrome were treated with either a vitex agnus castus extract or a placebo for three menstrual cycles. (verywellhealth.com)
4 (1997): 183 - 189; Schellenberg R. «Treatment for the premenstrual syndrome with agnus castus fruit extract: propective, randomized, placebo - controlled study.» (saragottfriedmd.com)
I have also started to take the following supplements daily; Ashwagandha root extract, vitamin D, vitamin A, Coq - 10, red clover, agnus castus drops, dong quoi and add raw macca powder to my smoothie. (nutritionfacts.org)