Is oxidized vitamin C serum bad for skin?

Is oxidized vitamin C serum bad for skin? Is oxidised vitamin C bad for skin? There are no scientific results to show oxidised vitamin C having an effect on the skin, however there are many cases of the skin irritation and staining due to the fact that oxidised L-ascorbic acid becomes the ingredient, erythrulose, which is formulated into self-tanning products.

What happens if vitamin C serum oxidized? Vitamin C That Has Oxidized in the Bottle

After contact with light, heat and air, vitamin C eventually oxidizes and loses its potency. You’ll know it when your serum changes colour, turning brown. (With L-ascorbic acid, this usually takes about three months after opening the bottle.)

Can you use vitamin C serum when it turns orange? 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.

When should you throw out vitamin C serum? Expiration time

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.

Is oxidized vitamin C serum bad for skin? – Additional Questions

How do you stop vitamin C serum from oxidizing?

Not storing it right

Store it in a cool, dark, dry place to prevent your serum from oxidising. Avoid sunlight exposure at all costs, and keep the lid completely sealed. If you’re super worried about being careless, keep the serum in your refrigerator instead — it’s probably for the best.

Why does vitamin C serum turned yellow?

After being exposed to air (like when you open the bottle) Vitamin C will oxidize and change color. Typically serums start out as clear and can degrade to yellow, orange, and in extreme cases all the way down to muddy brown.

Does vitamin C turn skin orange?

Vitamin C preparations can also discolor on the skin surface as they contact oxygen in the environment. This accounts for the orange color that may emerge on the skin in the morning after wearing a vitamin C preparation overnight. For this reason, vitamin C serums should be in light and oxygen impermeable packaging.

How do you know if vitamin C serum is oxidized?

“If it is completely yellow, brown, orange or any shade other than what it looked like when you first bought it, it most likely has gone bad,” says Dr. Houshmand. If you’re still unsure, take note of any scent or texture changes, which may also be a sign that it’s time for a fresh serum.

What color should vitamin C be?

Vitamin C is a very pale yellow color in its liquid state and nearly odorless at the time it is manufactured. As time goes by, exposure to heat, light and air causes oxidation. It is only after going through the oxidative process that the serum changes its tint to a darker yellow then eventually orange.

What should you not mix with vitamin C?

Ingredients You Should Never Mix With Vitamin C
  • Vitamin C + Benzoyl peroxide.
  • Vitamin C + Retinol.
  • Vitamin C + AHAs/BHAs.
  • Vitamin C + Niacinamide.

Why does vitamin C turn brown?

This is exactly what happens when Vitamin C serums turn brown. Vitamin C has oxidised (reacted with oxygen) and turned into dehydro-L-ascorbic acid and eventually diketogulonic acid. The yellow-brown colour change is a visual sign of chemistry change.

How long does vitamin C serum last after opening?

“Storing a vitamin C serum correctly is integral to its success,” Schlessinger says. “A good rule of thumb is to toss the serum six months after it’s been opened and to keep the serum in a cool, dark place.” If you’re using it according to the instructions, it’ll likely be gone before the six months is up.

Which vitamin C does not oxidize?

Use oxidation-resistant forms of vitamin C

Some of these oxidation-resistant vitamin C ingredients include: magnesium ascorbyl phosphate (e.g. from The Ordinary) sodium ascorbyl phosphate.

Should I refrigerate my vitamin C serum?

This is why most vitamin C and retinoid serums are packaged into dark bottles. To ensure longer product life, these should definitely be stored in the fridge. It won’t just make them last longer, but it’ll keep them effective for longer, and without a weird smell.

How do you know if vitamin C is expired?

A classic telltale sign of expired or oxidised Vitamin C is a change in colour. If you’ve spied that your once clear or light yellow serum is now looking a little deeper, or has changed shades entirely, you can take this as a pretty clear indication that your product has oxidised.

Can I use expired vitamin C on face?

Once your vitamin C has gone bad, it’s best to throw it away. Dr. Shamban says that at that point it can no longer go up against the free radicals responsible for causing oxidative damage to our skin. Having a hard time telling when your vitamin C is expired and has lost its potency?

What happens to expired vitamin C?

While vitamin C is likely not dangerous to take after its “use by” date, it almost certainly will have lost potency. One April 2019 study in the ​Brazilian Journal of Pharmaceutical Sciences​ found 92 percent of vitamin C supplements have significant losses in concentration amounts after 12 months of storage.

How do you know if your serum is expired?

If you’re unsure how old something is, the general rule is to toss anything that has significantly changed in color or odor, or separated, clumped, thickened or thinned, says cosmetic chemist Mort Westman. All are signs that the product has gone bad.

Leave a Comment