What is the skin turnover cycle duration for facial skin?

The skin's metabolic cycle on the face is typically around 28 days, but this value is not fixed and may vary with age, skin type, and external environmental factors. In general, adults have a slightly longer metabolic cycle than adolescents. A detailed analysis is as follows:

Skin metabolism refers to the process in which epidermal cells are generated in the basal layer, gradually move upward and differentiate, and ultimately shed as keratinized cells. During adolescence, when bodily functions are highly active, the facial skin metabolic cycle is approximately 28 days, with rapid turnover of the stratum corneum, resulting in smooth and radiant skin. As one ages, the metabolic rate gradually slows down; for every decade after the age of 30, the cycle may extend by 3–5 days. This can lead to the accumulation of old keratinocytes, making the skin prone to roughness and dullness.

Besides age, individuals with dry skin tend to have a relatively longer metabolic cycle, while those with oily skin generally experience a slightly faster turnover. Poor lifestyle habits such as chronic sleep deprivation, excessive UV exposure, and high stress levels can disrupt the normal metabolic rhythm, prolonging the cycle and potentially causing clogged pores, acne, and other skin issues.

In daily life, it's important to select appropriate skincare products based on individual skin type, avoiding over-cleansing or frequent exfoliation. Maintaining sufficient sleep, consuming a balanced diet rich in vitamins, and practicing proper sun protection help create favorable conditions for healthy skin metabolism and support overall skin health.