Yogis Herbs Senna Leaves Powder ( Cassia angustifolia – Alexandrian Senna – Cassia senna) or Known in Tamil Nadu, India as Nilavarai is a well known natural plant based laxative. Senna is considered to soften the stool by assisting the intestine to soak up more water and adding bulk. This allows for bowel movements that are quick and smooth as waste passes through the intestine. Supports Colon Cleanse and Digestive Health. We offer fine quality Nilavarai Leaf Powder (Senna Leaves Powder).