It is almost universally accepted that the skin requires care. Indeed, many people—in their pursuit of healthy skin—find themselves purchasing an ever-increasing array of skincare products that grow progressively more expensive, while their daily skincare routines become increasingly elaborate. But where, fundamentally, does the skin derive its nourishment?

First and foremost, it comes from the blood supply. In the absence of any applied skincare products, the skin’s nutrients are primarily derived from the sustenance provided by normal blood circulation. Observant individuals will notice that those who maintain a cheerful disposition, eat well, and sleep soundly tend to possess a complexion that is rosy and radiant. Conversely, those who frequently stay up late, suffer from insomnia, experience chronic stress and anxiety, or engage in binge eating often exhibit poor skin quality; the nutrients their skin receives are never "first-hand" resources, nor are they truly adequate.

The second source of care involves skincare products. Our bodies' innate concept of "healthy skin" differs somewhat from our own subjective ideals. To us, healthy skin typically implies a complexion that is fair, hydrated, smooth, and blemish-free—and it is precisely here that skincare products find their utility. However, the skin's structure incorporates a natural "skin barrier." While this barrier serves to protect the skin, it also acts as a buffer, regulating the interaction between the skin and the external environment. Consequently—and precisely for this reason—relatively few skincare ingredients applied externally are actually able to penetrate the skin deeply enough to exert their effects within the tissue.

Although skincare products cannot, by their very nature, resolve skin issues stemming from internal nutritional deficiencies or physiological imbalances at the root cause, they can nonetheless provide temporary relief. If the skin feels dry, they can replenish it with oils and hydration; if it lacks vitality, they can provide a boost of energy; and if the skin barrier is compromised, they can facilitate its repair. Crucially, skincare products also serve to enhance the aesthetic appeal of skin that is already healthy, making it appear even more beautiful.

So, what constitutes "skincare nutrient overload"? Some individuals find that the more comprehensive and meticulous their skincare routine becomes, the more prone their skin becomes to issues such as sensitivity, excessive oiliness, and the formation of *milia* (tiny white bumps). What, exactly, is happening here? In essence, the skin is suffering from a nutrient overload. This phenomenon stems primarily from two causes. First, the molecular size of the skincare products themselves may be too large; products with high molecular weights are unable to penetrate the deeper layers of the skin, and if they merely sit on the surface, they cannot be fully absorbed. Second, the skin's pores have a finite capacity; if low-quality products fail to break down effectively—failing to meet the necessary standards for molecular breakdown—the skin will be unable to absorb them, leading to an accumulation of unabsorbed substances and, consequently, a state of nutrient overload. Secondly, excessive use of skincare products can be an issue. In reality, skin cells have a finite capacity for absorbing nutrients; once their requirements have been met, they are unable to absorb any further nutrients, leading to a state of nutrient oversaturation.