You don't have to toss a serum if it's only slightly yellow but if it's tipping into orange, it's time to bin it. A dark orange would mean that your Vitamin C has over-oxidised and has lost a huge percentage of its efficacy. 14 мар. 2021 г.
What color should vitamin C be?
“Your vitamin C serum should be colorless or a light straw color,” Dr. Hogan says. “If it is oxidized, it becomes yellow or brown and is likely going to be less effective.”
Is vitamin C serum supposed to be clear?
Lipner says. The first thing to know is that when present in something like a serum, it should be colorless—and it should be stored in a dark place in a dark bottle. “When it's exposed to light, it becomes unstable,” she explains, which you can actually see take place because the product will turn yellow.
How do I know if my vitamin C serum is oxidized?
Many serums are yellow, but if your product takes on a brown or dark orange hue, it's time to toss because it's gone bad. If your serum starts out clear and turns yellow, that's also a sign it's oxidizing and will be less effective.
What color should timeless vitamin C serum be?
Fresh vitamin C serum should be clear or very pale yellow and should have little to no odor. As you begin to use the serum, opening the bottle and exposing it to light and air will cause the oxidation process to begin. Over time, you may notice the color getting slightly darker or the odor changing slightly.
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