Sealed & Fresh 1 OZ bottle. Created by Timeless Skin Care whose skin improving formulas have been acclaimed and are used by MDs (read the raving reviews about their Ferulic Acid serum). B5 is frequently used with the Ferulic Acid.; This serum contains Vitamin B5, a potent moisturizer, anti-inflammatory, and excellent wound healing ingredient; Also contains hyaluronic acid, which makes this formula an excellent and much needed moisturizer for your skin; Hyaluronic Acid is one of the most powerful hydrating and moisturizing ingredients on the market today. Holds up to 1000 times its weight in water. And as always, Timeless SC has used a higher concentration of HA than any other brand. This serum contains 5% HA, or about 8x the amount of HA contained in other brands' 60% concoctions.