How do I know if my vitamin C serum is oxidized?


The benefits of using a vitamin C serum are endless, as so many of us incorporate it into our daily routines. Even though vitamin C works wonders for the skin, it also has a downside in that it oxidizes, making the ingredient less effective and effective in treating the skin. 

There are many factors to consider when trying to determine if your vitamin C serum is oxidized. how does it look What should you do if you discover that your product has been compromised? How does it affect your skin? These are the questions we are going to find out today. 


How do I know if my vitamin C serum is oxidized? Vitamin C is an antioxidant, which means it's a powerhouse in keeping skin healthy and radiant, protecting it from free radicals and other skin-damaging aggressors. Vitamin C has the shortest shelf life of any skin care product, as its effectiveness diminishes once the product comes into contact with oxygen. 

The easiest way to tell if your vitamin C serum is oxidized is by looking at the color. Essences that contain a lot of vitamin C are transparent and turn yellow or brown about 3 months after opening. 

Once this happens, it's a clear sign that L-ascorbic acid is losing its potency and when it breaks down it becomes erythrulose, an ingredient you find in self-tanning products and can Lasts up to 7 days. The problem with erythrulose is that it also causes unnecessary damage to the skin when exposed to increased free radicals, causing the skin to have to repair itself. 


What should a vitamin C serum look like? 

It is always advisable to opt for a vitamin C serum, as mentioned, it has a clear look that shows how much vitamin C is in the formula and allows you to see if it is oxidized. 

While it may be difficult to reconsider your initial thought that vitamin C should be orange, some brands have been known to add coloring to their formulas to recreate this effect. Ideally, choose a colorant-free product in an opaque, airtight bottle to ensure the vitamin C stays as fresh as possible and isn’t exposed to too much UV light and oxygen, which can cause it to break down more quickly. leave. 

Can Oxygenated Vitamin C Serum be used? 

Once the product is opened and used, the life expectancy of vitamin C is approximately 3 months. After this, you should expect the formula to start to fade and take on a brown color. 

There's nothing stopping you from using the rest of the product, especially when it contains more than 10% active vitamin C, and it still works. People are concerned about how the serum will react with the skin and cause spots and irritation, and some people have developed breakouts like spots and blemishes. 

Is oxidized vitamin C bad for the skin? 

There is no scientific evidence that oxidized vitamin C affects the skin. However, in many cases, skin irritation and discoloration occur due to oxidized L-ascorbic acid becoming a component of erythrulose, which is processed into homemade vitamins. Tanning products. 

Oxidized vitamin C, no longer a powerful antioxidant, can lead to free radicals, environmental and daily aggressors, causing skin to become easily damaged and premature signs of aging like fine lines and wrinkles to become very visible and noticeable. 

Since L-Ascorbic Acid is very low in product formulations, and may even be absent altogether, you may find that vitamin C serums are less effective and have no effect on your complexion. 

Can vitamin C serum be used every day? 

Compared to other alpha hydroxy acids (also known as AHAs), vitamin C is safe when taken daily. With its ability to fight skin damage and other stressors, it provides a protective film to the skin as you go about your day. 

Due to its antioxidant properties, vitamin C serum is very effective in the morning. However, many people find that evening use allows the AHAs to do their work without the daily damage of exposure throughout the day. 

If you want to learn more about AHAs and how they affect your skin, you can check out our blog on AHA and BHA skin care benefits. When should you throw away your vitamin C serum? Once your serum starts to turn yellow, it's a clear sign that the formula has too much air in it, making the vitamin C less effective. 

Once the formula shows any discoloration, it is best to throw the product away completely. Vitamin C is a notoriously difficult ingredient to handle and is unstable in aqueous solutions, making it even more difficult to determine if the vitamin C portion is active and actually beneficial to the skin. 

In order to ensure the best treatment for the skin, it is worth noting the positioning of L-, if ascorbic acid is listed in the ink list on the packaging, it will not be effective enough for optimal results if she is ranked further than the sixth , then her skin will be affected. 


Here are answers to some of the most frequently asked questions about vitamin C and how to tell if it's oxidized. There's an in-depth blog post on the skin care benefits of vitamin C, so you can check it out and get a better idea of ​​what it's all about when you apply it to your skin and the results you'll see. 

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