Good product, but very undersized. The product feels good going into your skin, and seems to sink in if you give it 10-20 minutes. It's not very spreadable, so you have to use a generous amount in order to cover your face/neck.

Research Results

• INSTANTLY: 94% had instant luminosity and improved skin elasticity.
• IN 1 WEEK: 97% had visibly improved skin texture.
• IN 4 WEEKS: 100% had visibly brighter, tighter skin. 94% had a visibly more even skin tone. 100% had visibly reduced lines and wrinkles.

This RoC® face serum with Vitamin C visibly brightens and tightens better than the #1 luxury Vitamin C serum. * The supercharged formula is clinically proven to deliver instant luminosity to your complexion. In fact, 94% had instant luminosity; in just 4 weeks, 100% had visibly brighter and tighter skin.

Comparison of the best vitamin C serums

4 weeks This wrinkle serum with Retinol visibly reduces even the deep-set wrinkles that can be the most difficult to treat. The light, silky formula is clinically proven to visibly smooth, firm, and reduce wrinkles on your face and neck in just 4 weeks.

All RoC® products have been clinically tested & proven to deliver on the skin benefits promised. RoC® has conducted over 100 clinical studies to date. Studies on new RoC DERM CORREXION® Fill + Treat Serum demonstrated that an exceptional 97% of serum users had lines and wrinkles visibly reduced instantly.

While most people can tolerate daily use of vitamin C serum, some people may experience redness, irritation, or even breakouts. If you have sensitive skin, it's important to start slowly when using a vitamin C serum. Begin by using it every other day, and gradually increase to daily use if your skin can tolerate it.

The Vitamin C facial benefits extend to all skin types, including sensitive and dry skin. In addition to helping visibly fade discolorations or diminish fine lines and wrinkles, using a Vitamin C serum can also provide antioxidant protection to help defend from skin-damaging free radicals.

Vitamin C can make the skin more sensitive to UV rays, so it's important to wear sunscreen when using a Vitamin C serum. Vitamin C serum can also cause dryness, flaking and peeling of skin, especially if it is not formulated for your skin type.

So, how long does it take Vitamin C serum to work? In most cases, you will begin to see the long term effects of regular Vitamin C serum use in about six to eight weeks. Though, you may notice that your skin looks and feels softer, brighter, and more supple within a couple of weeks.

2 weeks to 4 months You may see results from as little time as 2 weeks to 4 months. These results could be brighter more luminous skin, less hyperpigmentation and more hydrated skin, or a decrease in wrinkles and fine lines (or both).

three months How long does vitamin C serum take to work? While every situation is different, most people see results from using a vitamin C serum within three months. Whether you're noticing a brighter complexion, plumper skin or improvements in hyperpigmentation, vitamin C can work wonders quite quickly!