What it is: A hyaluronic acid serum that strengthens skin while helping defend against skin-aging stressors. What it does: These stressors include UV exposure, pollution and extreme temperatures along with tobacco, stress, lack of sleep and nutrition, which can cause dullness, dehydration, fine lines and other signs of aging. How to use: Apply onto a cleansed face and neck, morning and night. It can also be used under another serum. Follow with moisturizer. 3.4 oz. has USD $173 Value Paraben-free; sulfate-free; phthalate-free Made in the USA