Blue Cohosh (Caulophyllum thalictroides) vs Chaste Tree (Vitex agnus-castus)

Blue Cohosh (Caulophyllum thalictroides)

Chaste Tree (Vitex agnus-castus)

About

Blue cohosh is an upright perennial herb reaching 3 feet in height, with large three-lobed leaves, yellow to purple flowers, and striking blue berries. It grows wild in much of eastern North America from Manitoba to Alabama, preferring woodland valleys and damp, north-facing slopes. The name 'cohosh' comes from the Algonquin language, and the plant was a popular remedy among many Native American tribes.

Chaste tree (Vitex agnus-castus) is a deciduous, aromatic tree growing up to about 23 ft (7 m). Its palm-shaped leaves and spikes of small lilac flowers produce dark, pepper-like berries in the autumn. The name “chasteberry” may reflect a traditional belief that the plant promoted chastity, and NCCIH says monks in the Middle Ages reportedly used it to decrease sexual desire. Chaste tree is commonly used for PMS, menopausal symptoms and infertility. NCCIH says it might ease PMS symptoms such as breast tenderness, but there isn't enough reliable evidence on infertility, and it may be unsafe during pregnancy.

Safety & precautions

Use only under professional supervision. Do not take during pregnancy or while trying to conceive, as it stimulates uterine contractions and could induce miscarriage. Avoid during heavy menstrual bleeding. NCCIH says the use of blue cohosh to induce labor has been associated with life-threatening complications in the infant, including seizures, and that blue cohosh may cause high blood pressure, high blood sugar and chest pain. The plant can be toxic and can cause contact dermatitis. Not recommended while breastfeeding.

Hormonal Interactions: May reduce the effectiveness of hormonal birth control. Pregnancy & Contraception: Not advised during pregnancy or while taking fertility treatments or contraceptive pills without professional guidance. Potential Side Effects: Excessive doses can cause a crawling sensation on the skin (formication), gastrointestinal upset, headache, or dizziness.

Safety text above is printed in full and is never abbreviated. For each plant’s complete precautions, drug and food interactions and preparation notes, open its own page - both are free.