NANDINI PREMIUM HAIR PRODUCTÂ Keshvardhak hair tonic is an ayurvedic tonic, it is prepared from medicinal roots and herbs. There is no mixture of any chemical element it is free from side effect to hair, it makes your hair soft, smooth & silky. It stops hair falling, spites and dandruff if used regularly. Its an excellent oil to give deep penetration and nourishment to the hair root.