Avalon Organics Shampoo Scalp Treatment Tea Tree (325ml). Avalon Organics Shampoo. Avalon Organics Tea Tree Shampoo is formulated for scalp discomfort, this shampoo, containing a medley of Tea Tree Essential Oil, Beta-Glucan, Aloe, Quinoa Protein and Vitamin E, works to gently cleanse and nourish hair and support scalp comfort.. pH balanced. This Avalon Organics shampoo Tea Tree formula is EWG VERIFIED™, which means it meets the Environmental Working Group's strictest criteria for ingredients, transparency, and health and features the EWG VERIFIED™ seal on its label.