Calamus Essential Oil (also known as Vacha) comes from India.
Calamus is used in Ayurveda to strengthen the adrenals. It is used during periods of weakness, and can be a stimulant to lymphatic drainage. It is used to increase stamina and endurance. It has a VERY strong scent. Blend it with Lavender or another sweet oil to calm it down.
While thousands of years of herbal use in India has demonstrated it's clinical effectiveness, NO INTERNAL USE with this oil is recommended. It does contain components that are known carcinogens.
USE UNDER THE CARE OF A KNOWLEDGEABLE PRACTITIONER.