When exploring whether niacinamide (Niacinamide) and glycolic acid (Glycolic Acid) can be used together, it needs to be analyzed in detail.

Niacinamide is widely used in the field of skin care and has multiple effects. It can help strengthen the skin barrier, improve the skin's ability to lock water, and make the skin firmer and shinier. At the same time, it is also effective in regulating oil secretion. For people with oily skin, it can effectively improve the oily appearance of the skin and maintain the balance of skin water and oil.

Glycolic acid, as a common fruit acid, can promote the loosening of the connection between the cells of the stratum corneum due to its unique chemical properties, which in turn accelerates the shedding of the stratum corneum and promotes the metabolism of the skin. This property allows glycolic acid to play a positive role in improving skin roughness, dullness, and fading pigmentation.

However, when the two are used together, there are many things to be aware of. Glycolic acid is acidic and will reduce the pH of the skin, while niacinamide stability will be affected in a specific pH environment. If the pH is too low, niacinamide may transform into niacin, which is highly irritating to the skin and can easily cause skin redness, tingling, itching and other uncomfortable symptoms.

Therefore, if you decide to use niacinamide and glycolic acid together, you must be careful. First, it is recommended to perform a local skin test. Apply a small amount of products containing both ingredients to more sensitive areas such as behind the ear or inside the arm, and observe for 24-48 hours. If there is no adverse reaction, it can be used on other parts such as the face. Secondly, the frequency of use should be controlled. Do not use it too frequently in the initial stage. You can start from 1-2 times a week. After the skin adapts, you can increase the number of uses according to the actual situation. Furthermore, in the order of use, you can use milder nicotinamide products first, and then use glycolic acid products after they are fully absorbed. This method may reduce the irritation to the skin to a certain extent.

In conclusion, although nicotinamide and glycolic acid each have excellent skin care effects, when used together, it is necessary to fully understand their characteristics and follow scientific methods in order to achieve the ideal skin care effect under the premise of ensuring skin safety.