Olay Deep Hydration Serum with Vitamin B3 + Hyaluronic Acid Olay's Deep Hydration Serum with Vitamin B3 + Hyaluronic Acid ($29) is like a giant glass of water for your skin. Its key ingredients are vitamin B3 and hyaluronic acid, both of which work to help your skin stay hydrated and look fresh. Image Source: olay.com Deep Hydration Serum with Vitamin B3 + Hyaluronic Acid $29 from olay.com Buy Now