The fruit of the chasteberry tree (Vitex agnus castus) was shown in limited studies to relieve some of the symptoms of PMS. However, further studies are needed to clarify this association and to determine the value of chasteberry fruit as a potential therapy for PMS. Since herbal preparations are not regulated by the US FDA, caution is warranted when taking this or any kind of over-the-counter supplement. While evening primrose oil and gingko biloba are plant extracts that have been promoted by some as remedies for PMS, there is no evidence that these products are effective, and they are not recommended.
Vitamin supplementation with calcium, magnesium have been shown in some trials to help alleviate symptoms of PMS, and may have some benefit. Taking calcium and magnesium supplements may help some women. It is always important to recommend guidelines when taking vitamin supplements, since taking excess of some supplements may be harmful.