Sunscreens and the Prevention of Skin Aging

Abstract

It has been well established in both human and animal skin that ultraviolet radiation from both ultraviolet B (UVB) (290 nm-320 nm) and ultraviolet A (UVA) (320 nm-420 nm) can produce profound changes in the skin that with recurrent exposure, cause it to become what we recognize as photoaged skin. Experimental studies in animals have confirmed that some sunscreen chemicals are capable of providing protection against ultraviolet-induced photoaging. It is presumed that regular use of these effective sunscreens will also reduce skin aging changes in humans.

A study on the alterations in skin viscoelasticity before and after an intradermal administration of growth factor

“…[1–4] Meanwhile, the dramatic increases in average life expectancy in recent years place great demands on QOL in later life. From a cosmetic standpoint, a rejuvenating method with safe, reliable, and long-lasting effects is eagerly awaited.…”

“…From a cosmetic standpoint, a rejuvenating method with safe, reliable, and long-lasting effects is eagerly awaited. [4] The mainstay treatments for skin rejuvenation nowadays are cosmetic surgeries, epidermal resurfacing, skin tightening (lasers, high radio-frequency (RF), intense pulsed light,[9] etc. ), and autologous fat injection.…”

“…[1–3] and the back of the hands [Figure 1]. While photo-aging is thought to be preventable by a complete blockage of UV rays,[4] there is no epoch-making method for rejuvenating the skin once it has aged. [34] Treatments with fillers,[5–9] botulinus toxin injections,[10] autologous fat injection or lasers and intensive pulsed light[11] are ancillary and confer only temporary effects that wear off without repetitive, continuous treatment.…”