Coptis chinensis, a bitter berberine-rich root from Chinese medicine: traditional uses, phytochemistry, preparation, interactions and contraindications.

Lesser celandine (Ficaria verna): traditional uses for hemorrhoids, key compounds, preparation methods and why the fresh plant is toxic and calls for caution.

Black cumin (Nigella sativa): seeds traditionally used for immunity, digestion, and inflammation, with preparation methods, dosing, and contraindications.

Goldenseal (Hydrastis canadensis): traditional uses, phytochemical profile, preparation methods, and contraindications for this berberine-rich rhizome.

Black Cohosh (Actaea racemosa): traditional menopause relief, tea, capsule, and tincture preparation, contraindications and side effects explained.