What is the best vitamin c serum, and why don’t others work?

Types of Vitamin C: Which is the most effective?

Do you have any idea how to distinguish between a good Vitamin C product and those that are ineffective or even oxidize the skin? Here we will give you several recommendations to know how to choose the best Vitamin C products.

Vitamin C is an antioxidant that offers multiple benefits and is suitable for all skin types, including sensitive skin. For this reason, it has become a starting point for the skincare industry.

Interestingly, Vitamin C in its pure state is very unstable, so getting a product that does not oxidize in the presence of air, light, heat, or water is a great challenge. Vitamin C loses its effectiveness when it deteriorates and can be harmful since instead of protecting the skin against free radicals, it oxidizes it. This results in blemishes, premature cell ageing, and irritation, among other things.

The best form of vitamin C that guarantees that it does not oxidize so quickly and therefore does not oxidize your skin is ethylated ascorbic acid (Ethylated Ascorbic Acid). It is the most stable form of vitamin C known to date. Time and contains benefits equivalent to or even more significant than pure vitamin C.

It has a molecular weight closer to the natural Vitamin C, allowing obtaining results in less time.

Vitamin C activates the production and synthesis of collagen in the skin, in addition to neutralizing the damage of free radicals that cause premature ageing.

Its only disadvantage is its price since it is 100 times more expensive than other forms of Vitamin C. Fortunately, there are products on the market that contain this ingredient at very competitive prices.

Ideal concentration of Vitamin C for the skin

The ideal concentration to see the visible results that vitamin C offers you is 20%. Still, you can find products on the market in different concentrations ranging from 5% to 30% and even in combination with other ingredients.

You could also find products added with vitamin C where you only look for antioxidant power but be careful; in addition to looking for a serum with a 20% concentration of vitamin C, it is most recommended that it be ethylated vitamin C.

How to choose the best Vitamin C serum

Here are some recommendations that you should take into account to choose the ideal product with Vitamin C.

  1. Verify that its composition does not contain water, as it can become oxidized, regardless of the type of Vitamin C.
  2. In the market, you can find creams, lotions and serums with Vitamin C; opt for amber serums or a dark one that does not allow light to pass through since these types of bottles help protect the product from oxidation.
  3. Look for your serum to contain a base such as propanediol or some other emollient free of water.
  4. It is essential to check the consistency, smell and colour of the product. If it shows a yellowish tint, a slimy texture or a rust smell, stop using it immediately, as it could cause irritation and damage to your skin.
  5. For a product with Vitamin C to last longer and not oxidize, keeping it in a dry, cool place and away from direct sunlight is essential.
  6. Ingredients that should not be mixed with Vitamin C

Since we have given you information on choosing the best Vitamin C serum, you should consider that there are certain ingredients with which it should not be combined since they can present a risk to your skin or counteract its effect.

Benzoyl peroxide 

It is widely used in acne products because of oxidizing agent that kills acne-causing bacteria. It contains bactericidal, anti-inflammatory and comedolytic action. However, when combined with vitamin C, the benefit of both ingredients will be lost.

AHA’s (Alpha Hydroxy Acids)

Alpha hydroxy acids are ingredients used primarily to make chemical peels, the most popular of which are glycolic acid, lactic acid, malic acid, and mandelic acid. If you want to use AHA’s as part of your skincare routine, avoid applying them simultaneously as Vitamin C, as this can alter the pH and cause severe irritation.


Also known as vitamin B3, it is an essential nutrient for our body’s cellular processes. However, it is necessary to wait at least 30 minutes after applying Vitamin C to use it since it can irritate the skin due to its acidic pH.


Ingredients such as retinoic acid or retinol should not be mixed with some types of unstable Vitamin C, such as pure Vitamin C (ascorbic acid) with a concentration greater than 15%, since this combination can be abrasive on the skin. However, some alternatives provide the same benefits as retinol.

Leave us in the comments what caught your attention in this article, and if you already use a product with Vitamin C in your skincare routine, we love to read your opinion!

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