Mr. Smith Serum - New “Serum Treatments Weightless and restorative, Mr. Smith’s Serum contains argan, jojoba and hempseed oil that moisturises and nourishes, while strengthening damaged and brittle hair. This antioxidant-rich, leave-in product is specifically designed to promote stronger, healthier hair, while providing added heat and UV protection. PETA certified vegan. Sulfate and paraben free.”