Quick Summary:
Date Tested: 6/25/2026
In this Skinceuticals Physical Fusion UV Defense SPF 50 sunscreen lotion review, I test an exemplary SPF 50 sunscreen. Thanks again go to Mollie for this sample!
The Skinceuticals Physical Fusion UV Defense SPF 50 is a physical sunscreen formula which contains Zinc Oxide at 5% and Titanium Dioxide at 6%. This product is a tinted formulation.
The Skinceuticals Physical Fusion UV Defense SPF 50 reduced 98.63% of irradiated UVA, 97.41% UVB, and 98.55% of total UVI. Very nice results, wow!
Skinceuticals Physical Fusion UV Defense SPF 50 ingredients
Active ingredients: Zinc Oxide 5%, Titanium Dioxide 6%
Inactive Ingredients: Water, Dimethicone, Isododecane, C12-15 Alkyl Benzoate, Undecane, Triethylhexanoin, Isohexadecane, Nylon-12, Caprylyl Methicone, Butyloctyl Salicylate, Phenethyl Benzoate, Styrene/Acrylates Copolymer, Silica, Tridecane, Dicaprylyl Carbonate, Dicaprylyl Ether, Talc, Dimethicone/PEG-10/15 Crosspolymer, Aluminum Stearate, Pentylene Glycol, PEG-9 Polydimethylsiloxyethyl Dimethicone, Alumina, Polyhydroxystearic Acid, Phenoxyethanol, Magnesium Sulfate, Caprylyl Glycol, Iron Oxides, PEG-8 Laurate, Disteardimonium Hectorite, Triethoxycaprylylsilane, Tocopherol, Propylene Carbonate, Artemia Extract, Benzoic Acid, PEG-9, Disodium Stearoyl Glutamate, Aluminum Hydroxide
Manufacturers Website: www.skinceuticals.com
Skinceuticals Physical Fusion UV Defense SPF 50 characteristics at a glance:
- SPF 50: provides high broad spectrum UVA/UVB protection
- 100% mineral/physical filters: zinc oxide (Z-Cote®) and titanium dioxide
- Tinted formula with translucent color spheres for natural radiance and even finish
- Weightless fluid texture, breathable, non-whitening
- Contains artemia salina (plankton extract) to boost skin’s resistance to UV- and heat-induced stress
- Designed for facial use
- Shake then apply dispersal technology for even distribution
- Viscosity is low, essentially a liquid
Prepared slide BEFORE testing
The Skinceuticals Physical Fusion UV Defense SPF 50 distributed very evenly on the prepared slide sample with no significant thinning of the layer of sunscreen towards the center of the slide. This is indicative a well formulated sunscreen. There were some air bubbles, but these did not affect the results.
Skinceuticals Physical Fusion UV Defense SPF 50 UV blocking test results
Ultraviolet light quick reference:
UVA: The Ultraviolet wavelength from 315nm – 400nm. The “Aging UV light” – Causes wrinkles.
UVB: The Ultraviolet wavelength from 280nm – 315nm. The “Bad UV light” – Causes skin cancer.
UVI: The global sun UV index. The more a sunscreen can reduce the level of UVI, the better.
UV test results:
Ultraviolet sensor readings:
| Before Sunscreen | After Sunscreen | % UV Blocked | |
|---|---|---|---|
| TEMP | 74.15 | 75.8775 | |
| UVA | 36,380.5 | 497.75 | 98.63% |
| UVB | 2,183 | 56.5 | 97.41% |
| UVI | 21.575 | 0.3125 | 98.55% |
Want to know more about how I test sunscreen? Head here to read about the details.
Testing notes:
For such a low viscosity, this sunscreen provides great UV blocking protection! This is also a tinted formulation.
Want to try the Skinceuticals Physical Fusion UV Defense SPF 50?
Great sunscreen!
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