When the sun shines on the earth, we feel the warmth, but we also suffer from the threat of **: ultraviolet rays. In every ray of sunlight, there are factors that may cause aging, sunburn and even cancer. Yes, ultraviolet rays, the invisible enemy, are quietly affecting our ** health.
Let's start by understanding ultraviolet rays, delve into the science of sun protection, and learn how to effectively protect our ** in our daily lives.
Ultraviolet (UV) rays are the part of sunlight that has the greatest health impact. It is divided into two main types, UVA and UVB, each of which has a different effect on **. UVA, with strong penetration, mainly causes aging, while UVB, although it has weak penetration, is the main culprit of sunburn and cancer. Knowing this basic information is essential for choosing and using sunscreen products.
The working principle of sunscreen products can be divided into two categories: physical sunscreen and chemical sunscreen. Physical sunscreen, which reflects or scatters ultraviolet rays, like a tiny mirror, reflects ultraviolet rays away**. Common physical sunscreen ingredients include titanium dioxide and zinc oxide. Chemical sunscreen absorbs ultraviolet rays through its chemical composition and converts them into heat for release, thereby reducing the damage of ultraviolet rays. In this type of product, common ingredients are religious acid, methoxycinnamic acid, etc.
When choosing a sunscreen product, it's important to understand your skin type and product properties. Every skin type has its own specific sun protection needs, and with so many different types of sun protection products on the market, how do you make an informed choice?
Skin type identification and product selection
Dry**: Choose a sunscreen that contains moisturizing ingredients, such as hyaluronic acid and glycerin. Avoid products that contain alcohol as they may exacerbate** dryness. Oily**: Suitable for lightweight, oil-free sunscreen lotion or gel. Avoid products that are high in oil content to reduce shine and prevent clogged pores. Hybrid**: You can choose a moderately moisturizing but non-greasy sunscreen product to balance the needs of the T-zone and cheeks. Sensitivity**: It is recommended to use physical sunscreen (such as products containing titanium dioxide or zinc oxide) to reduce irritation caused by chemical ingredients.
Understand SPF vs. PA
SPF (Sun Protection Factor).: This indicator reflects the product's ability to protect against UVB rays, the ultraviolet rays that cause sunburn. The higher the SPF value, the longer the protection time. In everyday life, SPF 30-50 is sufficient for most needs. PA (UVA Protection Rating).:p A signifies the degree of protection against UVA (ultraviolet rays that cause aging) to:"+"The number of indications. In daily life, choose at least "PA++" level products.
Sun protection options for special occasions
Outdoor activities: Choose a water-based or water-resistant sunscreen to protect against sweat or moisture. Indoor or city living: Choose a sunscreen with a low SPF but contains antioxidants (e.g. vitamins C and E) to protect against indoor light sources and screen radiation.