When you buy a serum vitamin C, some important things you need to consider is the expiry date. Vitamin C serums usually have age save about 6-12 months after it opened. Therefore, make sure you use it every day to avoid redundant.
Then, make sure you also store serum vitamin C coated that dark and cool. Because the serum vitamin C is easily oxidized by exposure to light. When you find the serummu began to change color, texture, smell or become murky, stop usage immediately! The possibility of the serum have experienced oxidation.
In addition, when using this serum, it's good you tried it once was on hand. If it does not happen to worrying about the reactions, then you can apply it on the face.
Use the levels a little bit first. See how his progress. Ideally, anyway, use serum does not cause a breakout or pimples. Instead, thus making the skin look brighter and cleaner.