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You should be using a hair sunscreen to protect your scalp and hair from damage due to UV rays. We tested and reviewed 9 products, and consulted experts, here.
For example, UV rays damage a natural form of protein everyone has in their hair called keratin. Keratin strengthens and protects hair, making it look brighter and feel softer.
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The sun protection factor (SPF rating, introduced in 1974) is a measure of the fraction of sunburn-producing UV rays that reach the skin. For example, "SPF 15" means that 1 ⁄ 15 of the burning radiation will reach the skin, assuming sunscreen is applied evenly at a thick dosage of 2 milligrams per square centimeter [65] (mg/cm 2). It is ...
Ultraviolet radiation, also known as simply UV, is electromagnetic radiation of wavelengths of 10–400 nanometers, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight , and constitutes about 10% of the total electromagnetic radiation output from the Sun.
Exposure to UV-B radiation causes increased melanogenesis. The purpose of melanogenesis is to protect the hypodermis , the layer under the skin, from damage by UV radiation. The color of the melanin is black, allowing it to absorb a majority of the UV light and block it from passing through the epidermis.
Keratinocytes contribute to protecting the body from ultraviolet radiation (UVR) by taking up melanosomes, vesicles containing the endogenous photoprotectant melanin, from epidermal melanocytes. Each melanocyte in the epidermis has several dendrites that stretch out to connect it with many keratinocytes.
But Sachajuan Hair In the Sun and Hair After the Sun can help All that sunshine leads to color fading, premature aging, and general dullness. Shop this video: Save your hair from sun damage
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