Horsetail contains a high level of silica. Silica is a compound that strengthens both nails and hair. Horsetail plant is also known to improve blood circulation which leads to healthier hair follicles.
Because of its silica content, horsetail is also useful when trying to stimulate hair growth. The herb rejuvenates your hair, adding sheen to the appearance and strength to the hair shafts. It also contains selenium and cysteine, which are known to promote healthy hair growth. Both of these substances contribute to healthier hair and prevent free radicals from damaging the cells.