Fruit acids are classified into various types based on molecular structure, with most derived from natural sources. Commonly used ingredients in cosmetic procedures include citric acid, glycolic acid, and lactic acid.
What are the primary functions of fruit acids?
Function 1: Regulates keratinocyte metabolism
Fruit acids typically act directly on the epidermis, loosening excessively adhered keratinocytes and facilitating the natural exfoliation and removal of accumulated dead skin cells.Take closed comedones as an example: these occur when excessive keratin buildup locally blocks sebaceous gland openings, preventing normal secretion of sebum. This leads to comedones appearing on the skin surface. FAs effectively regulate keratin metabolism, keeping follicle openings clear. This facilitates unobstructed oil secretion, ultimately alleviating closed comedones.Some women struggle with persistent acne, often due to numerous microscopic comedones hidden beneath the skin's surface, resembling tiny seeds. AHA can penetrate deep into the skin layers to dissolve these minute comedones.
Effect 2: Promotes Collagen Proliferation
Fruit acids gradually penetrate the dermis, stimulating the production of elastic and collagen fibers. After multiple treatments, skin biopsies reveal a significant increase in these fibers within the epidermis, along with enhanced dermal density. This boost in density and elasticity results in firmer, more resilient skin.
Effect 3: Accelerates Skin Metabolism
Skin cells undergo a natural renewal cycle. AHA accelerates this turnover rate while expediting the migration of pigment particles toward the skin's surface. This boosts metabolic speed and facilitates the shedding of the stratum corneum.When epidermal keratin metabolism slows excessively or accumulates heavily, skin may appear dull and sallow. Significant pigment buildup in the basal layer can cause dark spots, while systemic pigment deposition may lead to melasma. Fruit acids can help fade and alleviate these conditions. Glycolic acid is particularly effective due to its low molecular weight and strong penetrating power, aiding in treating keratosis pilaris and acne. Start with a lower concentration and gradually increase as skin adapts.
Important Reminder
Always select fruit acids under medical supervision. Avoid indiscriminate use, as it may damage skin, causing it to become increasingly thin and sensitive, or even leading to broken capillaries. Maintain daily skincare routines, consume ample fruits and vegetables, avoid spicy or irritating foods, cultivate a positive mindset, avoid late nights, ensure sufficient sleep, and engage in moderate exercise to accelerate metabolism.