[Product Question] What to do when a newly purchased Vitamin C serum turns yellow within 20 days of opening?

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What to do when a newly purchased Vitamin C serum turns yellow within 20 days of opening?What's the way to go about in a situation like this?Should I stop using the serum as I no longer know if it's effective or even safe for use anymore? Possibly, throw it away.ORAsk the brand for a replacement or a refund?. . .A little background : I purchased a new Vitamin C serum last month. Upon opening, the colour was fine as it should be. I started to use it on a daily basis but noticed it was slowly turning into a yellowish hue. Now, after 20 days of opening and using it, it has definitely turned visibly yellow.I was expecting the serum to be more stable as the form of Vitamin C used is Ethyl Ascorbic Acid along with Vitamin E and Ferulic Acid.I have already reached out to the brand regarding this issue and I'm waiting for their response. Until then, I'm not sure if I should go public in this sub with the brand's name and pictures of my serum.
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Submitted by annyeongchingus