Made with Yukon Horsetail. So what is the deal with horsetail? Horsetail is rich in silica which if applied topically to hair is known to help strengthen and restore shine. A silica deficiency is one of the causes of hair loss. Our No Poo is Sodium Lauryl Sulfate Free. Enriched with Aloe, Tea Tree and Silk Protein it is a great treat for dry winter hair and scalp.