The 5 Essential Vitamins™: Vitamin E, Vitamin H, Vitamin C, Vitamin B5, Vitamin B3. VO5 has a unique formula with 5 Essential Vitamins that help nourish, moisturize and hydrate hair leaving it looking and feeling thicker, fuller and simply beautiful. That's the secret of VO5. Long Lasting Fragrance 5 Essential Vitamins™ for Healthy, Beautiful Hair This Product Not Tested On Animals