What are the potential benefits of chasteberry for women?

Spotted a bottle of chasteberry in your local health shop and wondered what it actually is? This little purple plant – also known as agnus castus or vitex agnus castus – comes from a sun-loving shrub that thrives around the Mediterranean and parts of Asia, bursting with lilac flowers and berry clusters.¹

Scientists think chasteberry acts on the pituitary gland – the brain’s hormone control centre. Research suggests it can reduce levels of prolactin, a hormone that sometimes drives PMS signs like sore breasts, headaches and mood swings.^4,5 

The clearest research win for chasteberry so far is its potential in supporting premenstrual syndrome (PMS). A major Cochrane review showed that women taking it reported fewer PMS symptoms than those on placebo – from easing irritability and low moods to reducing breast tenderness.³

Perimenopause often comes with PMS-like symptoms such as hot flushes, disrupted sleep and mood changes. Some early, emerging studies suggest chasteberry extracts or oils may help ease these, though more research is needed. ^{4, 9, 10}

Because of its hormone-balancing reputation, chasteberry is being trialled to support fertility. It may help women with short luteal phases (the second half of the cycle after ovulation), improving the chances of implantation⁴. However, the evidence is mixed and focuses on related reproductive issues rather than health outcomes that directly focus on fertility. More research is needed in this area – so watch this space.

Yes – you’ll sometimes find dried chasteberry in herbal teas. While tea can be a gentle way to try it, most clinical studies use standardised supplements in capsule or liquid form². Tea may not provide a consistent dosage, but it can still be enjoyed as part of a daily self-care ritual.

Most people find chasteberry safe, but like any supplement, it can cause side effects ^3,5 such as:

You shouldn’t take chasteberry if you’re pregnant, breastfeeding or have pituitary conditions. It may also interact with hormone-based medicines such as HRT or the contraceptive pill, so always check with your GP first. ^{1, 2, 4}

You won’t find chasteberry on your plate, as it’s not something we get from food. The easiest way to give it a go is through supplements, which come in options such as:

Chasteberry – also known as agnus castus – has been used in women’s health for centuries. Today, most research has looked at its potential to ease PMS, while emerging studies are exploring its role in perimenopause, fertility and even hormone-related anxiety ^{3, 4}

Disclaimer - This article provides informational advice and is not a substitute for medical care. Curated by experts for accuracy, we take great care to ensure the information is up-to-date and relevant. However, you should always consult your GP or healthcare professional before using supplements or alternative products, particularly if you have medical conditions or are under supervision. Always speak to a healthcare professional before starting any new supplement.