Consider nanoparticles.
"To make mineral sunscreens more cosmetically appealing, the particles can be micronized (made smaller)," says Dr. Ip. "There is still some [discussion] about how small is too small, and whether nanoparticles can again be absorbed by the bloodstream, so I suggest my pregnant patients avoid them."
This being said, the evidence we have gathered regarding SPF and nanoparticles thus far says that the likelihood of them causing any harm is realistically very low, so it really comes down to personal preference in whether you choose to avoid them or not.
Avoid irritants, especially if you have sensitive skin.
Because mineral sunscreens don't sink into your skin like chemical sunscreens, they tend to be far less irritating and sensitizing. "With mineral sunscreens, you really cut down the potential for any reaction," says Dr. Gohara. Dr. Ip agrees, "If you have sensitive skin, stick to mineral sunscreens; If you have allergies, stick to mineral sunscreens." "I also suggest pregnant people avoid any fragrances—you want to keep it as simple as possible," Dr. Gohara adds. Fender agrees, too, adding that "from a holistic perspective, the fewer ingredients and the more natural, the better when pregnant."
Opt for a tinted formula.
Tinted sunscreens often contain ingredients like iron oxide, which can be particularly helpful for anyone dealing with melasma (a form of hyperpigmentation largely caused by hormones that are also called "the mask of pregnancy"), says Dr. Garshick. Iron oxides help protect skin from blue light (which can trigger melasma) and also help camouflage its appearance.
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