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Wed Oct 06, 2010 6:03 am  |
Does anyone know which of the physical sunscreens - based on zinc oxide as the main ingredient or only ingredient - utilize zinc particles that are *** coated ***??
I understand that the zinc particles are far more stable if coated.
I recall writing an email about this to Burnout, but never got a response.
Anyone?
Thanks, BF |
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Wed Oct 06, 2010 7:37 am |
| Osmosis Shelter SPF 29. The product contains silica coated Zinc Oxide. I use some very good sunscreens for the face (i.e., Devita, Pratima, Burnout, Marie Veronique), but if I had to pick just one, this would be it. |
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Wed Oct 06, 2010 7:55 am |
I'm pretty sure that burnout isn't coated (and I like it that way). When zinc oxide isn't coated I'm getting the other benefits of zinc oxide besides sun protection- the anti acne, calming and healing benefits.
Zinc oxide is super stable to begin with so coating it with something doesn't do much to the stability... If it made a difference, most sunscreens would use coated zinc oxide. The coating only matters for solubility and easthetic issues. |
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24 yrs old. favorite sunscreen right now: Burnout [now 35] |
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Wed Oct 06, 2010 8:01 am |
| Hahaha, it's tough getting info out of some companies! All I got from burnout on the zinc oxide they're using is that it's 1 micron or larger (meaning it's not nano particles) and someone else was told that it's not zinclear. I'm going to assume that it's not coated since they didn't say that it is and because of how my skin likes it (my skin loves zinc oxide). |
_________________
24 yrs old. favorite sunscreen right now: Burnout [now 35] |
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Wed Oct 06, 2010 11:44 am |
| rlook wrote: |
| Osmosis Shelter SPF 29. The product contains silica coated Zinc Oxide. I use some very good sunscreens for the face (i.e., Devita, Pratima, Burnout, Marie Veronique), but if I had to pick just one, this would be it. |
I like Osmosis Shelter, I agree it is very nice, but I don't like its price, especially with mailing charges  |
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Wed Oct 06, 2010 1:26 pm |
According to Dr. Baumann, metal oxides (such as TIO2 and ZnO) used in sunscreens can produce free radicals on the skin and even damage DNA, although if the particles are large enough that they do not traverse the stratum corneum, they are "not expected to be biologically active".
She mentions this is a bigger problem with TIO2 than ZnO - but some manufacturers coat the particles with silicone to minimize this possibility.
I avoid TIO2 for this reason and would like to find coated ZnO to ensure the integrity of my skin.
Since the issue of micronized particles and nanoparticles is unclear to me, it seems that coating the particles would help to eradicate any possible damage.
I'd like to think we use sunscreen to prevent skin damage, not to create more of it.
BF |
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Wed Oct 06, 2010 2:20 pm |
BF,
I know Lacy53 posted on one thread a good while back the exact sizes of micro compared to nano particles, I don't know if I can find the thread or not but micro are far to large to even penetrate the SC of our skin! I will see if I can find the post, but I know I have no worries about micronized zinc oxide or titanium dioxide.  |
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I'LL SEE YOU ON THE DARKSIDE OF THE MOON.... |
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Wed Oct 06, 2010 3:34 pm |
I haven't found Lacy's post yet but did find this.
A nano particle is 1,000 times smaller than a micro particle.
micro: 10^-6
nano: 10^-9 |
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I'LL SEE YOU ON THE DARKSIDE OF THE MOON.... |
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Wed Oct 06, 2010 4:23 pm |
Yes, as mentioned, she believes that as long as particles are of a certain size, they do not penetrate the SC. The silicone coating adds another layer of protection, sort of like insurance.
To be quite honest, this is the reason I no longer apply vitamin based serums to my face in the daylight either - oxidation.
Anything that will oxidize on your face doesn't seem good to me. Rust never sleeps.
BF |
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Wed Oct 06, 2010 6:31 pm |
Barefootgirl,
I understand what you are saying about light being oxidative. This may be a stupid question but what about oxygen, as I understand oxidation that is at least as bad as light if not worse? |
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I'LL SEE YOU ON THE DARKSIDE OF THE MOON.... |
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Thu Oct 07, 2010 6:31 am |
ok, this will sound facetious, but yes oxygen too 
I mean living long enoug will age and kill me too, but I try to avoid anything that hastens the process. 
BF |
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Sun Oct 10, 2010 5:34 am |
Ive been researching sunscreens recently and have come to the following conclusions...
The safest suncream seems to be to use a physical zinc oxide barrier cream. If the cream is to be effective and safe from a non-skin penetrating point of view, then it will leave a pasty white film on your face. I guess thats the trade off - look a bit pasty but be safer.
Loving Naturals sunscreen uses larger particles of zinc oxide along with some natural ingredients. I would reccommend this. I would also expect zinc oxide ointment or diaper cream to do the same job as long as there is at least 20% zinc oxide in them.
I also think that too much of anything will be bad eventually, so i try and alternate between using zinc oxide mostly then a titanium dioxide cream occasionally. |
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Sun Oct 10, 2010 11:08 am |
I have researched this to death and have concluded that until further studies are available and/or regulatory changes, I am going to stick to zinc oxide based sunscreens - either "micro" (not nano) or if nano (coated).
It's not easy or inexpensive, but the potential for skin damage is harder and more expensive,IMO.
Tradeoffs, BF |
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havana8
Moderator
 
Joined: 09 Sep 2005
Posts: 3451
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Sun Oct 10, 2010 12:14 pm |
Yes, Thanks Havana! That thread has a great deal of information about sunscreen controversy! There are however a number of studies linked too that are very interesting! |
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I'LL SEE YOU ON THE DARKSIDE OF THE MOON.... |
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Mon Oct 11, 2010 8:15 am |
yes, thank you, it's helpful to keep the pertinent info altogether.
Basically, I have concluded that the jury is still out (and maybe for some time).
Until then, it appears the consensus is that some or many sunscreens could be unhealthful or problematic, but less unhealthful or problematic than UV exposure in the absence of photoprotection.
BF |
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Sat Feb 26, 2011 1:46 pm |
Eminence Vanilla sun cream has zinc oxide only
or Skinceutical physical sun screen also has zinc oxide only |
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