Oxidised vitamin C is no longer a powerful antioxidant resulting in free radicals, environmental and daily aggressors which leads to the skin vulnerable to damage with premature signs of ageing such as fine lines and wrinkles becoming very prominent and more noticeable.
Is it OK to use oxidized vitamin C serum?
“If it is oxidized, it becomes yellow or brown and is likely going to be less effective.” You can still use it if you want, but it won’t do as much for your skin and, “very rarely, oxidized vitamin C products can even cause slight yellow discoloration of the skin,” Dr. Hogan says.
What happens when vitamin C gets oxidized?
Oxidation and reduction always occur simultaneously. As vitamin C is oxidized, the DCP is reduced and gains the two hydrogen atoms lost by the vitamin. As the DCP is reduced, it changes from red to colorless.
What does oxidized vitamin C mean?
When your vitamin C serums turn yellow brown, vitamin C has oxidized. That means less of the vitamin C serum benefits are available for your skin – oxygen from the air has gobbled them up.
What vitamin C should not be used on skin?
AHAs and BHAs, such as glycolic, salicylic, and lactic acids should never be used with Vitamin C. Vitamin C is an acid, too, and is unstable, so the pH balance will be thrown off by layering these ingredients together and might as well be useless.
Is it OK to use expired vitamin C serum?
You would think that using oxidized vitamin serum won’t do much harm, but actually it does if it has lost all its potency. If your serum has less than 10% potency then it will not only turn yellow-brown but will also stain your skin and you will also feel some irritation.
Can I still use vitamin C serum if it turns yellow?
When in the vitamin C is in high concentration, the serum will have a yellowish color; but as it oxidizes, it will turn brown/orange. Cosmetic vitamin C preparations that have discolored should be discarded as they have already oxidized and cannot provide skin benefits.
How do you reduce the oxidation of vitamin C?
1. Oxygen and ascorbic acid oxidation. The oxidation of ascorbic acid can be slowed down/prevented if there is no oxidizer present. In other words, a molecule has to be present that will receive the electrons.
How do I know if my vitamin C has 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.
How do you keep vitamin C serum from oxidizing?
To keep your vitamin C serum from breaking down, always close the bottle tightly as soon as you finish using it. Keep the bottle in a cool, dark place, like your refrigerator, and never store the serum in the bathroom, since fluctuations in temperature and humidity can cause the formula to break down more quickly.
What does oxidized vitamin C smell like?
Color: Your serum should be white, clear, or a light champagne color. If the product is dark or cloudy in color, the serum may have oxidized and should be returned or gotten rid of. Smell: Vitamin C serums should have little to no odor. If it smells sour, it’s no good.
Can I use vitamin C with salicylic acid?
Don’t mix… vitamin C and acidic ingredients, like glycolic or salicylic acid. Like Wee says, it’s all about the pH! … So using them with acidic ingredients like glycolic or salicylic acid can alter its pH, which can reduce the effectiveness of your vitamin C.
Can I use niacinamide with vitamin C?
So, can you use niacinamide and vitamin C together? The short answer to your question: yes, you can. … It’s also worth pointing out that vitamin C is naturally found in our skin: “If the two ingredients weren’t compatible, we’d all suffer when using topical niacinamide,” says Arch.
What should you not mix with vitamin C?
Aspirin and nonsteroidal anti-inflammatory drugs (NSAIDs) — Both aspirin and NSAIDs can lower the amount of vitamin C in the body because they cause more of the vitamin to be lost in urine. In addition, high doses of vitamin C can cause more of these drugs to stay in the body, raising the levels in your blood.
Should you use vitamin C serum everyday?
Vitamin C serum is typically applied once or twice per day. A good rule of thumb is to cleanse, tone, apply vitamin C serum, and then moisturize. It can be safely used with other active ingredients, although using alongside niacinamide may make vitamin C less effective.
Can I use retinol with vitamin C?
The truth: You can use vitamin C with retinol and retinoids. Get them as separate products so you can tailor the concentration of each and use them at the right time of day. Although vitamin C can be used day or night, it is ideal for daytime use, while retinol and retinoids should be applied at night.