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skinceuticals physical fusion uv defense spf50 p
Physical Fusion UV Defense SPF50®
Board-Spectrum tinted lightweight UVA/UVB Sunscreen with
Transparent Zinc Oxide (Z-Cote)

e 50ml
This true broad-spectrum sunblock contains 5% transparent Zinc Oxide with 6% Titanium Dioxide to help protect against the damaging effects of UVA and UVB rays. It is a light weight formula with color-infused technology that creates a sheer, universal tint for all skin tones.
  • 5% Z-Cote + 6% Titanium Dioxide
  • Strong UVA Protection
  • SPF 50 UVB Protection
  • Translucent color spheres, to provide a sheer tint suitable for all skin tones
  • Use Under Makeup or used alone
  • Artemia Salina, a plankton extract that increases your skin’s ability to protect itself against UV and heat stress

Ingredients: 5% Zinc Oxide, 6% Titanium Dioxide. Water, Dimethicone, Isododecane, C12-15 Alkyl Benzoate, Undecane, Triethylhexanoin, Isohexadecane, Nylon-12, Capylyl Methicone, Butyloctyl Salicylate, Phencythl Benzoate, Styrene/acrylates Copolymer, Silica, Tridecane, Dicapylyl, Carbonate, Dicapylyl Ether, Talc, Dimethicone/PEG-10-15 Crosspolymer, Aluminum Stearate, Pentylene Glycol, Peg-9 Polydeimthcylsiloxyethnyld Iethicone, Alumina, Polyhyroxystearaic Acid, Phenoxyethanol, Magnesium Sulfate, Capylyl Glycol, Iron Oxides, PEG-8 Laurate, Disteradimonium Hectorite, Triethoxycapylylsilane, Tocopherol, Propylenen Carbonate, Artemia Extract, Benzoic Acid, C9-15 Flouroalcohol Phosphate, Peg-9, D46941/2..
Doctor’s Comment:

Sunlight contains UVA and UVB, where UVA is the energy which causes freckles and aging on the skin. SPF only tells how strong a sunscreen is against UVB, it does not tell you how strong it is against the skin aging UVA.

The best substance to block UVA remains to be Zinc Oxide. At 5% it has good UVA protection. Microfine treatment of Zinc Oxide makes them look transparent.

This is a very light sunscreen with a tint of color, so even with liberal application it settles very quickly without making the whole face white.

Even with Zinc Oxide, short duration sunscreens only last 1/2 an hour under very strong sunlight, and last not greater than 4 hours by itself.
Advanced Comments:

Zinc Oxide and Mexoryl can protect the whole spectrum of wavelengths given by UVA, while Titanium Oxide/Dioxide does not have total wavelengths protection. Mexoryl is a chemical sunscreen where the sunlight oxidize it instead of the skin, so it can be used up. Zinc Oxide is a barrier sunscreen where it blocks UVA.

This is not a waterproof formula, so it doesn't last as long as waterproof or long duration formulas, and is less ‘sticky’. At 5% some people will still find it uncomfortable.

This sunscreen is formulated to be very light, but you need to shake it before use. As it is quite watery, the moisturizing property is not high, however, it can be put on quickly and with a light tint already in it, it wont makes your face all white and you do not need to wait 15 minutes before you can go out. 

For a normal (short-duration) sunscreen such as this one, it should be replenished every 1/2 an hour under strong sunlight, or every 4 hours if under usual daytime. This formulation also contains moisturization properties, and is a plus in most cases.