Through reflection, it is a physical powder sunscreen ingredient. Can block UVB and part of UVA (requires high concentration to fully protect against UVA). Usually, if you want to achieve a higher SPF, a high concentration of titanium dioxide (above 5%) will be added, which often causes the skin to be white when rubbed, and the skin is dry and easy to peel because it not only absorbs oil, but also absorbs moisture. It has high covering power and high oil and water absorption properties . Due to technological progress, the whitening and unevenness of such physical sunscreens have been improved in recent years.
Because it has the ability to refract UV, and at the same time can resist the color change after sun exposure, it is often used in sunscreen products. In addition, because of its properties as a pigment, it is also often used for white-related purposes. It is also used in medical cosmetology. copy application .
 Wikipedia, the free encyclopedia, http://en.wikipedia.org.
安全，因為滲不進皮膚，即便滲入也不發生刺激或化學反應 (取自張麗卿 博客分享)
所以酸化チタン就是指氧化鈦。完整寫法應該是『二酸化チタン(英文: titanium dioxide)』、『単に酸化チタン(英文: titanium oxide)』。
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Approved in: United States, Australia, Europe, Japan
Banned in: None
Best for: Sun damage prevention
Coral safe? Detectable levels but no harm found
Caution: Formulas may leave white cast on darker skin, and ingredient may be carcinogenic in powder form
Found in physical sunscreens
There are two sunscreen ingredients generally recognized as safe and effective, or GRASE, by the FDA, and both are physical sunscreen ingredients. (Note: the GRASE label also means that the FDA won’t be monitoringTrusted Source products with these ingredients.)
The first one, titanium dioxide, serves as a broad-spectrum UV filter (although it doesn’t block long UVA1 rays).
The FDA approves titanium dioxide for use in children older than 6 monthsTrusted Source, and research shows it’s generally safer than other sunscreens via skin exposure.
However, researchers also write that power and spray forms should be avoided as it may be hazardous. A 2011 reviewTrusted Source notes that titanium oxide nanoparticles through oral exposure are classified as “possibly carcinogenic to humans,” meaning only animal studies have been conducted.
Keep in mind this ingredient isn’t limited to sunscreen. It can also be found in SPF makeup, pressed powders, lotions, and whitening products.