![Amazon.com: Korean Skin Care K Beauty - 20% Vitamin C Hyaluronic Acid Serum + CE Ferulic Acid Provides Potent Anti Aging, Anti Wrinkle Korean Beauty 1oz : Beauty & Personal Care Amazon.com: Korean Skin Care K Beauty - 20% Vitamin C Hyaluronic Acid Serum + CE Ferulic Acid Provides Potent Anti Aging, Anti Wrinkle Korean Beauty 1oz : Beauty & Personal Care](https://m.media-amazon.com/images/I/71rFT+zLX3L._SL1300_.jpg)
Amazon.com: Korean Skin Care K Beauty - 20% Vitamin C Hyaluronic Acid Serum + CE Ferulic Acid Provides Potent Anti Aging, Anti Wrinkle Korean Beauty 1oz : Beauty & Personal Care
![Product question] just got my mad hippie vitamin c serum, is this colour normal? Exp date is in 2021 : r/SkincareAddiction Product question] just got my mad hippie vitamin c serum, is this colour normal? Exp date is in 2021 : r/SkincareAddiction](https://preview.redd.it/f7qjvujt7wf21.jpg?auto=webp&s=eeba959fbd9908f4c41ca5f54cb86b89d34c42ff)
Product question] just got my mad hippie vitamin c serum, is this colour normal? Exp date is in 2021 : r/SkincareAddiction
![Amazon.com: Mizon Real Vitamin C Ampoule, Pure Vitamin C 19% No Water Added, Only 10 Ingredients Formula for tone correction treatment, Nutrition and Face Moisturizer : Beauty & Personal Care Amazon.com: Mizon Real Vitamin C Ampoule, Pure Vitamin C 19% No Water Added, Only 10 Ingredients Formula for tone correction treatment, Nutrition and Face Moisturizer : Beauty & Personal Care](https://m.media-amazon.com/images/S/aplus-media/sc/af366179-b27a-46fe-86f8-2d5a09c832e2.__CR0,0,970,600_PT0_SX970_V1___.jpg)
Amazon.com: Mizon Real Vitamin C Ampoule, Pure Vitamin C 19% No Water Added, Only 10 Ingredients Formula for tone correction treatment, Nutrition and Face Moisturizer : Beauty & Personal Care
![Mai on Twitter: "Once your vitamin C serum oxidised it will no longer be effective......the period if I'm not mistaken is up to 4 months after opening until the vitamin C serum Mai on Twitter: "Once your vitamin C serum oxidised it will no longer be effective......the period if I'm not mistaken is up to 4 months after opening until the vitamin C serum](https://pbs.twimg.com/media/DVr3JYsU0AEmN4h.jpg)
Mai on Twitter: "Once your vitamin C serum oxidised it will no longer be effective......the period if I'm not mistaken is up to 4 months after opening until the vitamin C serum
![How bad is it to use oxidised Vitamin C product? When do you toss it out? [Product Question] : r/SkincareAddiction How bad is it to use oxidised Vitamin C product? When do you toss it out? [Product Question] : r/SkincareAddiction](https://preview.redd.it/o44doi719bvx.jpg?width=640&crop=smart&auto=webp&s=15ccb3f1278034c653739ac38f2e6e483ebad967)
How bad is it to use oxidised Vitamin C product? When do you toss it out? [Product Question] : r/SkincareAddiction
![product question] when is vitamin C considered too oxidized that it's harmful? Details in comments : r/SkincareAddiction product question] when is vitamin C considered too oxidized that it's harmful? Details in comments : r/SkincareAddiction](https://preview.redd.it/f8d6yyu5u6j51.jpg?auto=webp&s=a14991d8e61bb33ce38f7e5c5bed75bb5d77d7fe)