7 mistakes when using vitamin C serum that prevent your skin from improving as desired.

Here are some common mistakes to avoid to maximize the benefits of vitamin C in your skincare routine.

Using it at the wrong time of day.

Many people wonder whether to use vitamin C in the morning or evening, but in reality, morning is considered the ideal time. At that time, vitamin C helps protect the skin from the effects of UV rays and pollution. However, a common mistake is applying it and going outside immediately, causing the active ingredients to be affected by sunlight before they have had a chance to absorb. To ensure effectiveness, wait for the product to dry completely before exposing it to the outside environment, and combine it with sunscreen for enhanced skin protection.

Many people wonder whether they should take vitamin C in the morning or evening, but in reality, morning is considered the ideal time.

Skip the pre-cleaning step.

Inadequate cleansing of the skin hinders the absorption of vitamin C. Dirt, excess oil, or accumulated dead skin cells can cause the active ingredient to react undesirablely on the skin's surface. For oily skin, this easily leads to clogged pores and breakouts. Meanwhile, dry or aging skin may become rough and flaky due to a thick layer of dead skin cells preventing absorption. Thorough cleansing is a crucial foundational step to maximize the effectiveness of the serum.

Incorrect order in the skincare routine.

Vitamin C needs to be used correctly in your skincare routine to be most effective. The general rule is to apply products from liquid to thick. Applying vitamin C after moisturizer or facial oil will create a film that hinders the active ingredient's absorption into the skin. The logical order should be cleansing, toning, then vitamin C serum, and finally moisturizer to lock in moisture. Following this order will help maximize the effectiveness of your skincare steps.

Vitamin C needs to be used correctly in a skincare routine to be most effective.

Do not use on damaged skin.

Using high concentrations of vitamin C on skin that is inflamed, scratched, or has recently undergone invasive procedures can cause severe irritation. Some forms of vitamin C work in highly acidic environments, making the skin more sensitive and causing stinging or peeling. When the skin is not yet stable, prioritize recovery first, before reintroducing vitamin C into your skincare routine.

Misunderstanding about the concentration and form of vitamin C.

Higher concentrations don't necessarily mean better results. In fact, around 10%–20% is considered a suitable level to balance effectiveness and safety. Using high concentrations from the start can cause skin irritation, especially for sensitive skin. Furthermore, each form of vitamin C has different properties, from potent pure forms to more stable derivatives. Choosing the right form for your skin condition will determine long-term effectiveness.

Incorrect combination with other active ingredients

A common mistake is using vitamin C at the same time as stronger active ingredients like retinol, AHA/BHA, or benzoyl peroxide. These ingredients can reduce each other's effectiveness or cause skin irritation. For optimal results, separate the applications, for example, using vitamin C in the morning and other targeted treatments in the evening. This allows for better absorption while minimizing risks.

Improper storage of Vitamin C products is crucial because Vitamin C is easily oxidized when exposed to light, air, or high temperatures. Storing it in a humid environment or not sealing the lid tightly after use will cause the product to deteriorate quickly. When the serum turns dark yellow or brown, it's a sign that it has oxidized and is no longer effective. To maintain quality, choose products with airtight, dark packaging and store them in a cool, dry place.

Vitamin C will be most effective when used correctly and at the right time. Avoiding common mistakes not only saves money but also helps protect your skin and minimize unwanted problems during skincare.