There are many issues that can contribute to hair thinning or fallout (stress, lack of sleep, vitamin deficiencies, hormonal changes, increased DHT and miRNA22 levels, impaired micro-circulation and poor scalp health). Frequently, it's a combination two or more of these issues. That is why a holistic, 360º approach to hair wellness is the most effective way to promote hair health. Our proprietary plant-based, multi-tasking GRO Hair Serum uses a combination of clinically-tested vegan actives known in some subjects to inhibit the production of DHT & miRNA22, promote healthy circulation, soothe scalp irritation as well as revitalize & strengthen roots. Free of harmful chemicals, carcinogens or scary side effects, this cruelty-free serum is formulated with powerful phyto-actives shown in clinical studies to increase visible hair density while reducing the appearance of shedding to bring you thicker, fuller hair*.