Wood Ridge Labs ~ Thickening / Pro-Growth Shampoo for Men 25 fl oz. Ineffective blend of hair, strengthening, nutrients, this every day, thickening shampoo, leaves your hair, feeling thicker and fuller. Formulated with biotin and caffeine to nourish and help promote healthy, strong here. Lightly fragrance with tea tree, and meant to refresh and invigorate the scalp and senses.