Which type of UV ray is known for penetrating directly into the dermis and damaging collagen?

UVA rays are indeed known for their ability to penetrate deeply into the skin, reaching the dermis layer where they can cause significant damage to collagen and elastin fibers. This penetration leads to premature skin aging, loss of elasticity, and an increased risk of skin cancer. Unlike UVB rays, which primarily affect the outer layers of the skin and are mainly responsible for sunburn, UVA rays can penetrate more deeply and are associated with long-term skin damage. This characteristic makes UVA rays particularly concerning in skincare, as they contribute to the formation of wrinkles and other signs of aging. Understanding this helps estheticians advise clients on sun protection and the importance of using broad-spectrum sunscreens that protect against both UVA and UVB radiation.