How to Tell if a Vitamin C Serum Oxidized – Phyto-C Skin Care
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The color of the vitamin C serum will give you a good idea if it is still effective to use. If your vitamin c serum is clear or a light yellow in color, the serum was most likely manufactured less than a year ago and stored properly. If the vitamin C serum is yellow, it was most likely manufactured over 6 months ago.
The color of the vitamin C serum will give you a good idea if it is still effective to use. If your vitamin c serum is clear or a light yellow in color, the serum was most likely manufactured less than a year ago and stored properly. If the vitamin C serum is yellow, it was most likely manufactured over 6 months ago with proper storage. A serum that is dark brown in color indicates the vitamin C serum has oxidized and will not be as effective and should be discarded. If the vitamin C serum hasn’t been opened, the serum could have been improperly stored or has been manufactured over a year ago.
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