On the choice of glycolic acid strength
Those who want to use glycolic acid should first understand its strength. This is the gist of effectiveness and safety.

The strength of glycolic acid varies, the low is mild, and the high is fierce. Those who are new to glycolic acid should start from a gentle place, and the skin needs to be gradually adapted. If you use high-strength acid suddenly, you may be intolerant to the skin, causing erythema and tingling.

Ordinary maintenance, if you want to gently rejuvenate the skin, make the skin smooth and uniform in color, choose low-intensity glycolic acid. It can light exfoliation, promote skin metabolism, and do not disturb skin stability.

However, for those with rough, dull skin, or acne or fine lines, slightly higher intensity glycolic acid may be a good choice. It can penetrate the skin deeply, exfoliate more powerfully, and stimulate collagen production to achieve significant improvement. However, when applying, be sure to pay attention to the skin's reaction and gradually increase the frequency.

As for the determination of strength, it is still necessary to refer to the skin characteristics. Dry skin, delicate and sensitive, should choose low strength; oily skin, good tolerance, or can try higher strength.

Overall, the choice of glycolic acid strength cannot be achieved overnight. It should be based on personal skin conditions, desired efficacy, and prudence in order to achieve both the benefits of skin beauty and avoid the risk of damage.