How to prevent UV damage
How to Prevent UV Damage
Understanding Ultraviolet Light
UVA
320-400nm
Occupies 98.9% of surface UV
Weak damage
Can penetrate the ozone layer
UVB
280-320nm
1.1% of surface UV
Strong damage
Most of it is absorbed by stratospheric ozone and increases due to the destruction of ozone
Effects of UV rays on skin
UVA
It reaches the dermal layer of the skin and damages elastic fibers and skin capillaries, causing skin aging, darkening, and loss of elasticity.
UVB
It can cause skin darkening and sunburn in the short term, and can cause skin cancer in the long term.
Ultraviolet Index (UVI)
During an hour of strong sunlight at noon (approximately 11:30~12:30), the amount of accumulated radiation per unit area of the ground reached by ultraviolet rays that cause skin redness, measured in hundreds of joules per square meter.
Comprehensive sun protection measures
Total body sun protection
Physical protection
Sunscreen lotions and creams
Antioxidants
Total body sun protection
2-3 grams of L-vitamin C and 1-2 grams of vitamin E per day will increase the low redness-causing dose of the skin.
Polypodiumleucotomos
?Carotenoids
Physical sunscreen
Clothing is an excellent way to protect yourself from the sun
Determining the sun protection ability of clothing depends on the density of weaving of clothing
Pure cotton and polyester cotton clothing have the same sun protection capabilities
Dark clothing has better sun protection effect
Sun protection is less effective when clothing is wet
The ability of the earth’s surface to reflect sunlight
Snow 85%
Sand 17%
Water 5%
Grassland 3%
Why choose products with SPF greater than 15?
The SPF measurement is calculated based on the minimal redness-causing dose of Minimal Erythema Dose (MED)
MED refers to a low dose that can produce reddish skin after exposure to light
If it takes 15 times for the skin to become red after applying sunscreen, its SPF is 15, which theoretically blocks 93.3% (14/15) of the ultraviolet effect.
Is SPF15 sunscreen product really enough?
SPF30vsSPF15
96.7%vs93.3%
Dosage: About 1-2g each time on face
Frequency: 2 hours
Location: Indoor, outdoor swimming pool, skiing
Skin type: gel, lotion, cream, ointment
How to choose sunscreen products that protect against UVA?
PA+,++,+++
IPD
PPD
Ingredients of sunscreen cosmetics
Sunscreen main agent
Anti-free radical substance agent
Dosage Form Excipients
Additives
Sunscreen main agent
Physical sunscreen
Principle: reflection, scattering
Common ingredients; Titaniumdioxide, Zincoxide, Silicate, ferricoxide
Chemical sunscreen
UVA:benzophenone,Parso1789,Mexory;
UVB: PABA Cinnmate and derivatives (Octyl-methoxycinnamate)
Antioxidants
Vitamin C
Divalent zinc ion
Flavonoid、polyphenoliccmpound
Fruits: blue plums, grapes, tomatoes, oranges and other citrus plants
Vegetables: cucumber, broccoli
Oil: Olive oil
Beverages: green tea, red wine K5YYZ7
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AA
