On the residence time of fruit acid
Fruit acid is a commonly used thing in the field of skin care. When it is applied, the residence time is quite critical, which is related to the effect of skin care and the state of the skin.

Those who use fruit acid for the first time should be cautious. You can take a small amount of fruit acid products first and apply them evenly to small pieces of skin, such as behind the ear or inside the forearm. The initial stay should be short, about 2-3 minutes. This short and long stay is designed to make the skin adapt to the stimulation of fruit acid. Causal acid has the ability to exfoliate to a certain extent. If the skin encounters it for the first time, it may be uncomfortable. Short-term contact can detect the degree of skin tolerance. If there is no adverse reaction such as redness, swelling, tingling, itching, etc., the subsequent use can appropriately prolong the stay time.

After multiple attempts, after the skin adapts, the stay time can be gradually increased to 5-10 minutes. However, it should be noted that different skin types have different tolerances to fruit acid. Oily skin, because its stratum corneum is relatively thick, may be able to withstand a slightly longer stay of fruit acid; dry, sensitive skin, thin stratum corneum, low tolerance, stay time should be carefully controlled, even after adaptation, should not be too long, so as not to damage the skin barrier, causing skin dryness, redness, tingling and other problems.

When using fruit acid products, environmental factors also need to be considered. If it is in a dry and cold environment, the skin loses moisture quickly, the residence time of fruit acid is too long, or the skin is exacerbated by dryness. At this time, the residence time should be appropriately shortened, or follow-up moisturizing care should be strengthened.

In addition, the residence time of fruit acid is also related to the product concentration. Low-concentration fruit acid products have relatively little stimulation and can stay for a slightly longer time; high-concentration products have strong irritation, and the residence time must be strictly controlled to prevent skin damage.

In short, there is no fixed standard for the residence time of fruit acid, and it needs to be flexibly adjusted according to factors such as individual skin type, frequency of use, product concentration and environment. Only by using it in a scientific and prudent manner can we leverage the power of fruit acid to achieve ideal skin care results and maintain skin health.