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Thu Apr 28, 2011 6:00 pm  |
Yes, exactly! There is a whole lot of fear mongering and magazine articles that say that you should be concerned, but if you actually read the studies, you realize that both zinc oxide and titanium dioxide are totally safe to use as topical sunscreen.
I did manage to track down the one study that articles pointed to as proof that physical sunscreen is harmful. I read it, and guess what? In the study, they tested the rats' reaction to titanium dioxide by intravenous injection. Intravenous injection means that the titanium dioxide was literally injected with needles into their bodies. Seriously, that is the only leg that the "nano sized physical sunscreen is dangerous" fear mongering and hand wringing is standing on.
What's frustrating about it is that agood scientist will hardly ever say that something is 100% safe- because you can't really know and there's always some range of uncertainty. But that little error range gets completely blown out of proportion. That's why although I'm not 100% sure that nano size titanium dioxide or zinc oxide is safe because I can't know that, I am confident enough about its safety not to worry about it, and to tell others not to worry about it. I'm certainly confident enough about the safety of micronized zinc oxide and titanium dioxide to slather the stuff on my skin every day!
| DarkMoon wrote: |
| Nimue wrote: |
| rockhugger wrote: |
| brierrose wrote: |
| I picked up a bottle of Cliniderm SPF45 the other day and I am really liking it. Non irritating and drys to a nice smooth matte finish...but it is micronized. So what is the consensus on the safety of micronized physical sunscreens? TIA |
I think the consensus is that micro is safe, but nano not. |
No that is not the consensus. There is hand wringing and fear mongering about nano size physical sunscreen but it has never been shown to be harmful. Zinc oxide, definitely harmless no matter what when applied to the skin in a cream/lotion type formulation. Titanium dioxide did show some harm but when I read the studies they injected the titanium dioxide into the veins of the rats and that's not how we apply sunscreen.
But yes, micro is certainly safe.
Regarding acne- that's a shame that someone told you that physical sunscreen is not good for acne prone skin Not true at all. |
Even the EWG (Environmental Working Group) notoriously cautious about ingredients rescinded their stance not only on micro but nano sized particles.
""When we began our sunscreen investigation at the Environmental Working Group, our researchers thought we would ultimately recommend against micronized and nano-sized zinc and titanium dioxide. After all, no one has taken a more expansive and critical look than EWG at the use of nanoparticles in cosmetics and sunscreens, including the lack of definitive safety data and consumer information on these common ingredients, and few substances more dramatically highlight gaps in our system of public health protections than the raw materials used in the bizarre and burgeoning field of nanotechnology. But 18 months, 800 products, and nearly 400 peer-reviewed studies later, we find ourselves drawing a different conclusion, and recommending some sunscreens that contain nano-sized ingredients.”
Nano Zinc Oxide? Hundreds of Studies Show It’s Safe! Really! | Clean Green Cafe" |
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24 yrs old. favorite sunscreen right now: Burnout [now 35] |
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