Shiseido Ultimate Sun Protection Cream for Face SPF 55 PA+++ has three active ingredients, while other products in Shiseido's line usually have a combination of two of the three listed in the 55 SPF (sun protection factor) sunscreen. The nonsticky and quick-absorbing formula has a PA rank of PA+++. This PA ranking is done on a +, ++, and +++ scale and shows the protection from UVA rays, with the higher amount of pluses indicating the higher the protection. The SPF rating shows the protection from UVB rays, with the higher the number, the higher the protection. The three active ingredients help guard against the sun’s damaging UVA and UVB rays on the skin.
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Ultimate Sun Protection Cream for Face SPF 55 PA+++ has 7.4 percent octinoxate as an active ingredient. Octinoxate is generically known as octyl methoxycinnamate and covers the UVB wavelengths of 280 through 320 nm (nanometers; nm are the common unit to describe the wavelength of light). It is absorbed into the skin, and SmartSkinCare.com notes that studies have shown it may promote free radicals. Octinoxate is the skin care industry’s most used UVB-blocking agent.
There is 2.2 percent titanium dioxide in the active ingredients of Shiseido’s Ultimate Sun Protection Cream. It blocks both UVB and UVA rays well in the 290 through 350 nm wavelength range and sporadically blocks the wavelengths 350 through 400 nm. It has been used for a long time in the skin care industry and is usually nonirritating to the skin. However, this is what gives you that unpleasant, white film in sunscreens.
Making up the majority of the active ingredients formula with 16.3 percent, zinc oxide is effective in blocking UVA and UVB rays. It works well in blocking wavelengths from 290 through 400 nm and gives sporadic coverage with wavelengths that are from 400 to 700 nm. It is an established sunscreen that is widely used and safe. It also, like titanium oxide, gives the wearer that white, pasty, sunscreen look.
Along with sunscreen properties, zinc oxide is also an anti-irritant and a skin protector, explains SmartSkinCare.com.