It is made from Acacia concinna, a shrub native to the warm, plains of central and south India. Acacia concinna has been used as hair treatment in India for centuries, it is now grown commercially in India and Far East Asia. The plant parts used are the dry powdered or the extract of the bark, leaves or pods.
Now there a lot of herbal products with shikakai commercially made like shampoo, conditioner, hair rinse etc. As for as the quality concerned it differs with brands. I am introducing some items for you to check and do a study on that. I am not recommending any particular product.