Should Vitamin C Serums Be Stored in Dark Glass Bottles? Why Not Plastic? Aug 08 , 2025

The Delicate Nature of Vitamin C

Vitamin C, also known as ascorbic acid, is a powerhouse ingredient in skincare, renowned for its antioxidant properties, ability to brighten the complexion, and stimulate collagen production.However, it's also a highly unstable compound. It's extremely sensitive to light, air, and heat.Once exposed to this substance, vitamin C will be quickly destroyed, lose its efficacy and become useless. Such decline not only prevents you from enjoying all the benefits brought by the essence, but may also cause side effects and skin discomfort.

The Advantages of Dark Glass Bottles

Dark glass bottle (usually amber or brown in colour) act as a shield for Vitamin C serum. The dark glass bottle acts as a natural filter, blocking most ultraviolet (UV) and visible light. This helps to slow down the oxidation process that occurs when vitamin C is exposed to light, thus maintaining the stability and potency of the serum longer. In addition, glass is an impermeable material, which means it is difficult for air to pass through. This better prevents Vitamin C from being oxidised by atmospheric oxygen, which ensures that each product remains undamaged until your end use.

The Drawbacks of Plastic Bottles

In contrast, plastic has several disadvantages when it comes to storing vitamin C serum. Firstly, plastic is usually more transparent to light than dark coloured glass. Even though this plastic bottle is tinted, it still allows more light to pass through, which can speed up the breakdown of vitamin c. Secondly, plastic is a porous material. Over time, air can slowly seep into the bottle through the small holes in the plastic, causing the serum to oxidise. Additionally, some types of plastic may contain chemicals that can leach into the product, potentially causing skin reactions or altering the ingredients of the formula.

glass bottle for skin serum

 

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