How to use a vitamin C serum

Although topical vitamin C is generally well tolerated, all skin products have the potential to cause side effects.

You should always do a patch test to assess your risk of allergic reaction.Here’s how:

1.Select a small area of skin that’s easy to conceal, like your forearm.

2.Apply a small amount of product and wait 24 hours.

3.If no side effects occur, you can apply it to your face. Discontinue use if you develop a rash, redness, or hives.

When it’s time for a full application, follow the instructions on the product’s label.It’s possible to have a skin reaction after repeat exposure, so it’s best to introduce new products one at a time, spaced out by a few weeks.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. Be sure to apply skin care products with clean hands.It can be safely used with other active ingredients, although using alongside products containing niacinamide may make vitamin C less effective.According to a 2020 reviewTrusted Source , the combination of tyrosine, zinc, and vitamin C has been shown to increase the bioavailability of vitamin C by 20 times that of vitamin C alone.

Potential side effects and risks 

Although irritation is unlikely, you should always do a patch test before full application.This is the only way to determine how your skin will react to the serum.If you have particularly sensitive skin, avoid products that contain L-ascorbic acid. Products containing magnesium ascorbyl phosphate may be less likely to cause irritation.

Vitamin C products

Serum stability is affected by two things: product formulation and packaging.

The following vitamin C derivatives are designed to retain potency for longer:

• L-ascorbic acid

• Ascorbyl palmitate

• Magnesium ascorbyl phosphate

You should also ensure that the product has a water-free formulation. And the bottle should be opaque and airtight.You can check out our favorite vitamin C serums categorized by how dry or oily your skin is.

The bottom line

Vitamin C can help heal blemishes, reduce hyperpigmentation, and give your skin an out-of-this-world glow.Consistency is key for maximum effect, so add it to your skin care routine in a way that makes sense for you.Some people apply it in the morning to take advantage of its UV-protectant properties, while others find that it works best as a night serum.Others apply it twice daily.Discontinue use if you begin to experience irritation or discomfort.