Hair Regrowth Tonics by Nutrafol. Details:A new and patent-pending advancement in scalp support, Growth Activator is the first of its kind: an extremely fast-absorbing and lightweight hair serum formulated with Ashwagandha Exosomes to boost cell-renewal and naturally activate thicker-looking, stronger-feeling hair in as little as 90 days. Growth Activator hair serum plays nicely with a daily Nutraceutical regimen. For best results, keep consistent.1.