The website says the Vitamin C Super Serum has a pH between 5.5 to 6.5. That means the Ascorbic Acid in this product will have no efficacy since Ascorbic Acid requires a pH under 3.5 for penetration. Personally I don't trust a brand that doesn't know how to formulate Vitamin C, therefore the entire line is out for me. Kết hợp Vitamin C và Arbutin giúp cải thiện rõ rệt tình trạng sạm nám, tàn nhang, bề mặt da xỉn màu. 2.2. Lưu ý khi kết hợp. Mặc dù có thể đem lại hiệu quả nhanh chóng trong việc cải thiện sạm nám trên da nhưng bạn cũng cần cân nhắc khi sử dụng Alpha Arbutin works pretty well with Vitamin C & Niacinamide. In fact, it can work with most of the ingredients including AHA, BHA, Kojic Acid etc in low percentage. Make sure to not use it continuously for more than 2-3 months to avoid damage. Give your skin some rest and then restart after sometime. Currently my faves are Timeless Vitamin C, CosRX galactomyces (niacinamide, ferment) and Kikumasamune high moist (arbutin, licorice, ferment). I have also used The Ordinary arbutin and Hada Labo Shirojyun which seemed to work fairly well, but I think the CosRx and the Kiku work better, plus I find them enjoyable to use. I'm about concerned about the Ascorbic Acid 8% + Alpha Arbutin 2% from The Ordinary I've been using for about the pat 3 months. It was fine when I first got it, but for the last couple of weeks I've noticed it started to smell really bad, almost like vomit. So this week I have incorporated TO Retinol 1% and TO Ascorbic Acid + Alpha Arbutin. Before I was using TO Retinoid in Squalane 5% and was never sensitive. Yesterday I have used TO AHA BHA, all was good, no irritation. After that I used Ascorbic Acid + Alpha Arbutin, then moisturized, then I covered it with foundation. A brighter, more radiant and even skin, for a younger, beautiful appearance. At the same time, vitamin C and Arbutin combination increases sunscreen effectiveness, raising the skin’s defense abilities against harmful UV exposure. Topically applied on a regular basis, the natural vitamin C and Arbutin extract mix improves skin color, evens Hi! I'm currently using the ordinairy ascorbic acid 8% + alpha arbutin 2%. It will not sink in. Not on naked skin and not with a toner or serum underneath either. It just sits there being wet and feeling oily. It's ok after I apply something on top, but really I'd be dislodging the vit C that way, wouldn't I? LbNrdh.