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Woman Receiving Kati Vasti, Ayurvedic Oil Treatment, Kairali Ayurvedic Health Resort, Palakkad, Kerala, India. In Kati Vasti, dough made from an herbal mixture is shaped into a ring and placed on the client's lower back. Warm, dosha-specific oil is poured into the ring and remains there for 30 to 60 minutes. This treatment strengthens the vertebral column, pelvic girdle, spinal cord and spinal nerves. It is good for alleviating all types of back pain, including a slipped disc and sciatica.