Titanium Dioxide
A mineral UV filter widely considered the safest sunscreen ingredient for pregnancy. Sits on top of skin with minimal systemic absorption; FDA-designated GRASE.
Quick answer
Titanium dioxide is one of the two preferred pregnancy-safe sunscreens (alongside zinc oxide). As a physical (mineral) UV filter, it sits on top of skin with minimal systemic absorption — the FDA designates it GRASE (Generally Recognized as Safe and Effective) for sunscreen use.
INCI name
Titanium Dioxide
CAS number
13463-67-7
Also known as
TiO2, titania, CI 77891
Formula
TiO2
What is Titanium Dioxide?
What titanium dioxide is
Titanium dioxide (TiO₂) is a naturally-occurring white mineral that has been used as a sunscreen active ingredient since the 1950s1. Unlike chemical UV filters (oxybenzone, octinoxate, avobenzone) that absorb UV radiation and convert it to heat, titanium dioxide is a physical (mineral) filter: it reflects and scatters UV light at the skin surface.
In sunscreens you’ll see it listed alongside zinc oxide on so-called “mineral” or “physical” sunscreens. It also appears as a pigment in food, toothpaste, and some cosmetics (where its CI number is 77891).
Why titanium dioxide is pregnancy-safe
The mechanism that makes titanium dioxide effective is the same one that makes it pregnancy-safe: it doesn’t need to be absorbed to work.
- Negligible systemic absorption. Pharmacokinetic studies show titanium dioxide particles do not penetrate intact skin into the bloodstream at meaningful levels — they sit on the stratum corneum and are washed off2. This contrasts sharply with chemical UV filters, several of which were shown in 2019/2020 FDA Maximal Usage Trials to reach systemic concentrations above the FDA’s 0.5 ng/mL threshold within a day of normal use3.
- FDA GRASE designation. In its 2021 final sunscreen monograph, the FDA proposed only two sunscreen actives as “Generally Recognized as Safe and Effective” (GRASE) — titanium dioxide and zinc oxide4. All chemical filters were placed in a category requiring more safety data.
- Mainstream obstetric guidance. ACOG, the American Academy of Dermatology, and similar bodies all recommend mineral sunscreens (titanium dioxide and zinc oxide) as the first choice during pregnancy5.
A note on nanoparticles and inhalation
Some titanium dioxide formulations use nanoparticle sizes for transparency on skin. The current scientific consensus, including from the EU SCCS and FDA, is that topical nano-TiO₂ does not penetrate intact human skin2. However, inhaling titanium dioxide powder is a different exposure route — the IARC classifies inhaled TiO₂ as “possibly carcinogenic to humans” based on rat lung studies6. For pregnancy, this means: pump or cream sunscreens with TiO₂ are safe; spray and loose-powder mineral sunscreens are best avoided to prevent inhalation.
Related questions
When to talk to your OB
If you used a product containing Titanium Dioxide before learning you were pregnant, mention it at your next prenatal visit — but most topical cosmetic exposures are not a cause for panic. For prescription exposures or specific concerns, contact your OB or midwife directly.
Sources
- Sambandan DR, Ratner D. (2011). Sunscreens: An overview and update. Journal of the American Academy of Dermatology. View source →
- Scientific Committee on Consumer Safety (SCCS). (2014). Opinion on titanium dioxide (nano form). European Commission. View source →
- Matta MK, Florian J, Zusterzeel R, et al. (2020). Effect of sunscreen application on plasma concentration of sunscreen active ingredients: A randomized clinical trial. JAMA. View source →
- U.S. Food and Drug Administration. (2021). Sunscreen Drug Products for Over-the-Counter Human Use. Federal Register (final monograph deemed final under CARES Act). View source →
- American College of Obstetricians and Gynecologists. Skin Conditions During Pregnancy. ACOG Patient FAQ 169. View source →
- International Agency for Research on Cancer (IARC). (2010). Carbon Black, Titanium Dioxide, and Talc — Monograph 93. WHO IARC. View source →