Most common questions used to investigate
Do you ever notice that vitamin C serums turn brown after sitting on the shelf for a month?
Do you have itchy skin?
Is vitamin C irritating to your skin?
Does your Vitamin C serum change color?
Common conclusions
You should stop using it. That brown color happened because the serum oxidized, and oxidation occurs in all serums containing vitamin C. Oxidation is a destructive process and when you put a vitamin C serum on your skin, it will cause oxidation and skin damage. This is due to the pro-oxidant effect of vitamin C in skin care.
Vitamin C serum, like any other skin care product, can cause side effects in some people. Itching is one of the most common side effects.
Vitamin C is made with a low pH, which can irritate the skin and cause it to flake. Through using it correctly, you can prevent these side effects, do not start with the strongest serum, you can work your way up to it.
It is so important to use up your L-ascorbic acid serum within three months of opening it. Yo shold keep it away from light and heat with the lid tightly closed, and toss it out as soon as the color changes or the scent becomes "off."
Great! You should continue using it.
References
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