Vitex (chaste tree)
Vitex agnus-castus
Herbs & Roots. Western & European.
Also called Chaste tree, Chasteberry, Monk's pepper, Agnus castus
Spanish: Sauzgatillo
Affects hormones; avoid in pregnancyA shrub whose dried berries are mainly used for premenstrual symptoms and irregular periods.
Did you know? Medieval monks were said to eat its peppery seeds to calm sexual desire, which is where the name monk's pepper comes from. That story is folklore, not proof.
What it may help, and how strong the proof is
- Women's health. Small trials of a standard extract found less premenstrual mood and body symptoms than placebo. Most trials are small and short, so the evidence is mixed.Early proof
- Pain & headaches. A 2020 meta-analysis found a benefit over placebo for cyclic breast pain, but bias was hard to judge in most studies.Early proof
Parts of the body
Traditional use
European herbalists used the berries for women's cycle problems for centuries, and German herbal monographs still list it for menstrual complaints.
How it is classified
- Herbal actions
- Hormone balancer, Antispasmodic. Energy: neutral.
How people take it
Most trials used a standardized extract taken for several menstrual cycles. Dried berry tea and tinctures are sold, but their strength varies and they are less studied.
Capsule, tincture and tea.
Where to get it
The shrub grows wild around the Mediterranean and in parts of Central Asia, and it is grown in Europe. Buy dried berries, capsules, or tinctures.
Be careful
Common side effects are headache, nausea, stomach upset, and skin rash. Vitex may change hormone signals, so avoid it in pregnancy, while breastfeeding, and with hormonal birth control. It may also work against dopamine-blocking drugs such as some antipsychotic and anti-nausea medicines.
Avoid if: pregnancy; breastfeeding; hormone-sensitive cancer; hormonal birth control; dopamine-blocking medicines.
Mixing with other things
- Works well together
Often sold together in women's cycle blends. Neither has strong proof for hot flashes.
- Works well together
Both are common in women's herbal blends for cycle and menopause symptoms.
- Works well together
Often combined in women's cycle blends.
- Use cautionBirth control (the pill and other hormonal birth control)
It may change hormone signals and could weaken birth control pills. Use a backup method unless a doctor says otherwise.
The honest take
The best human evidence is for PMS and breast pain, and the benefit looks modest. Many trials are small and short, and large, long studies are missing. Vitex does not replace a doctor's check for heavy bleeding or any new breast lump.