What is the primary function of red LED light in skin treatment?

The primary function of red LED light in skin treatment is to increase cellular processes. Red light therapy works by penetrating the skin and stimulating the mitochondria, which are the energy-producing structures within cells. This stimulation enhances the production of ATP (adenosine triphosphate), leading to increased energy levels in cells. As a result, this process can promote skin healing, improve circulation, and stimulate collagen and elastin production, which are essential for maintaining skin elasticity and reducing signs of aging.

The other options, while related to skin treatments, do not encapsulate the main effect of red LED light. Red light therapy is not primarily aimed at reducing redness, lightening pigmentation, or eliminating bacteria, although it can help improve the overall health and appearance of the skin, indirectly influencing those aspects. Thus, the ability of red LED light to enhance cellular activity and vital functions is what defines its primary usage in skin care regimens.