The Highest Quality and Best Value Vitamin C Serum on The Market Stays purer and stable for longer. You also will enjoy the added convenience of a 2 ounce bottle where most others are only 1 ounce. Go ahead and use it right away. We specifically chose a pump bottle as they work a lot better as well as delivering our smooth textured formula in an easier way. If you want to test it out, just start with a few drops anywhere on your face or skin. You will possibly notice an immediate tingling sensation and slight tightening straight away. Yes, it often acts that fast. This means it's working. Because our formula is so potent, and is filled with 2 ounce of Vitamin C Serum, you can stretch out one bottle for months on end. Or, you can apply liberally to any and all areas and enjoy a month's worth of usage before coming back here to order another bottle. What's the secret to our achievements? Well, our Vitamin C serum is specifically formulated to increase your skin's collagen production. That's why our formula is different to all others available on Amazon. Another secret-our stabilization process. We can't tell you the details on how we do this. We can only tell you that the more stable the Vitamin C, the more powerful it will be, and we know you can put us to the test against anyone else. Our Vitamin C Serum works exceptionally well with our "Renew" Phytoceramides as a double act so consider using both together as well as purchasing two bottles for uninterrupted use.