On the sequential use of nicotinamide and glycolic acid
The way of skin care is related to the nourishment of the skin, and the order of ingredients is also the key. Niacinamide and glycolic acid are both commonly used ingredients in skin care.

Niacinamide has many benefits for the skin. It can prevent melanin from moving to keratinocytes, making the complexion bright, radiant and radiant; and can strengthen the skin barrier, protect the stability of the skin, and resist external disturbances. Glycolic acid is a fruit acid and the like. The molecules are small and can enter the shallow layers of the skin, dissolve the adhesion between the cuticles, promote keratin renewal, make the skin smooth and tender, and reduce wrinkles and light spots.

However, when the two are used together, the order of order is very particular. It is advisable to use nicotinamide first. Cover nicotinamide can strengthen the skin barrier. If applied to the face first, it can build a protective wall for the skin. Later use glycolic acid. Although glycolic acid has the power to rejuvenate the skin, it also has irritating properties. It is buffered by the barrier built by nicotinamide, and the degree of skin irritation can be reduced.

If you use glycolic acid first, the stratum corneum of the skin is temporarily thin and the barrier function is slightly damaged. At this time, use nicotinamide again, or cause skin intolerance and discomfort, such as redness and itching.

Therefore, when taking care of the skin, the order of "first nicotinamide, then glycolic acid" should be followed. In this way, the synergistic effect of the two can be obtained, not only the protection of nicotinamide, but also the rejuvenation of glycolic acid, making the skin healthy and radiant.