Tip: C-Firma™ contains pure l-ascorbic acid and yields best results when used fresh, so use immediately and don't stock up. In the morning, apply evenly to clean, dry face, neck, chest, and backs of hands. Its pH level is 3.3, which Drunk Elephant believes is the key to a non-irritating formula. #Sunday riley tidal skinWhat is it? 15 percent L-Ascorbic acid, one-half percent ferulic acid (an antioxidant found in the cell walls of plants that enhances the stability and the efficacy of vitamins C) and one percent vitamin E.Ĭ-Firma™ has a reservoir effect, which means it will stay active on skin for up to 72 hours and cannot be washed or rubbed off. Other forms of Vitamin C- sodium ascorbyl phosphate, ascorbyl palmitate, retinyl ascorbate, tetrahexyldecyl ascorbate, magnesium ascorbyl phosphate, and ascorbyl glucoside. It’s said to be great for those who have sensitive skin types as it’s a more gentle formula of Vitamin C. Known to be one of the more stable types of Vitamin C. THD ascorbate (vitamin C) (found in the Sunday Riley CEO Serum)- also known as Tetrahexyldecyl ascorbate is a form of vitamin C which been modified to better penetrate the skin. It’s been said that people with both dry and oily skin textures can benefit from the usage, but not great for those with sensitive skin types. It usually comes in concentrations between 5-15%. L-Ascorbic acid is the most active, but known to be the most unstable and to oxidize quickly. It comes from natural sources like oranges. L-Ascorbic acid (found in the Drunk Elephant C-Firma)- known to penetrate the skin tissue and is more active in collagen production. I’ll mostly be discussing the following types of Vitamin C: I’ve been using various vitamin C serums for the past couple of years within my morning skincare routine. Some studies have even noted Vitamin C being able to help and prevent UV photo damage. Vitamin C is often used for its brightening effects and it’s anti-aging properties.
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