Hair growth is governed by follicular cycle- anagen, catagen, and telogen. Dr Rashi Soni explains herbal preparations like fenugreek, triphala, and aloevera lack clinical evidence for accelerating hair length in just seven days. Growth averages 1-1.5 cm per month. Nutritional status, hormones and genetics primarily dictate rate, with herbs supporting scalp health rather than inducing rapid growth.