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Mon Aug 08, 2005 3:23 pm  |
Today, I received a little packet sample of La Roche-Posay's Unifiance Fine Film Corrective Makeup. Of course, I thought, "Ooh! A compatible makeup to go with Anthélios on special occasions when I want to wear foundation!"
Well, I looked on the back, and see that, like most foundations at the end of the Ingredients list, it states, "May contain Titanium Dioxide & Iron Oxides."
Of course, assuming that it is indeed true that foundations containing iron oxides/titanium dioxide/zinc oxide negatively affects the efficacy of La Roche-Posay, I cannot imagine La Roche-Posay manufacturing and selling a foundation product that would ultimately degrade an ingredient in their very own line of sunscreens. Am I missing something? I didn't see the word "silicone" in terms of coating.
If this La Roche-Posay Unifiance foundation containing titanium dioxide and iron oxides is okay, then what makes other foundations/powders containing it not okay? Again, I must be missing something if this iron oxide hypothesis has authenticity. I know this theory has been studied and tested, so this is a bit mystifying to me.
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Mon Aug 08, 2005 8:58 pm |
| I actually emailed L'Oreal about 2 months ago, and asked them to explain it to me, but they never responded. Its not just you that's confused. Unless, of course, they are making products that are not suitable for use with their own sunscreens. I often wonder why sunscreen that is not photostable is even manufactured too??? |
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~normal but prone to dryness~slightly sensitive~usually clear~totm breakouts~mid 20s~ |
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Mon Aug 08, 2005 10:07 pm |
This is why I generally use Avene SPF50+ sunscreen, and only apply LRP FE when I'm barefaced (or nearly so). Since becoming "enlightened" about the incompatibility issue, I've started reading ingredient lists on new makeup I purchase. I'm amazed -- it seems almost everything has some kind of metallic substance in it! I'm hoping that Tinosorb, the very stable active in Avene, is protecting me enough. God knows it's a bother to purchase it (it's never on eBay, unlike LRP), and it's about $40+ USD per tube.
If LRP makes physical sunscreens, perhaps they would be compatible with the makeup sample. Don't we only have to worry about compatibility when it comes to chemical actives? |
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Tue Aug 09, 2005 1:50 am |
| Does anybody know if MAC blot powder has any of these metallic ingredients which degrades LRP sunscreens? Where can I see the ingredient list for it?...i tried to look but cannot find it. |
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Tue Aug 09, 2005 5:25 am |
| The fact that Anthélios XL Fluide Extreme 60 contains Avobenzone and Titanium Dioxide as its 9th & 10th ingredient throws me as well. |
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Tue Aug 09, 2005 6:08 am |
| Maybe Bad Bird will chime in on this -- I'm confused! |
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Tue Aug 09, 2005 8:14 am |
The fact is metal ions degrade avobenzone.
I don't think Loreal will tell consumers this because they want to sell their sunscreens and/or makeup. I even question how many employees in the huge parent company know about it, since probably only their scientists or researchers are in the know, and maybe a few select groups like the higher-ups.
Faith - the fact is, too, that avobenzone has a very good absorption curve in the UVA spectrum, and manufacturers of avobenzone are not going to care if it is photostable or not. We have Loreal to thank for for managing to stabilise it with the use of their patented Mex'es. And since the discovery of Tinosorb being a stabilising active, other manufacturers have chimed in as well.
M.april - Tinosorb M has even better absorption in the UVA curve (up till 400nm) than the Mex'es. It's just that the UVA protection factor of Avene SPF50+ is not as high as FE. If the UVA factor can match FE, I'll gladly switch to Avene exclusively anytime just for the completeness in the UVA protection. 
P.S. If your makeup contains RED iron oxides, then this has a negligible effect on avobenzone. Yellow and black iron oxides are the culprits - leading to a complete degradation of avobenzone. Better be conservative when the ingredient list does not specify which colours are used. |
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Tue Aug 09, 2005 7:01 pm |
Okay I found a list and Mac Blot powder has iron oxides:
Mica, Dimethicone, Silica, Kaolin, Water, Sodium Cocoyl Hydrolyzed Collagen, Methicone, Methylparaben, Propylparaben, Phenoxyethanol, Iron Oxides, Ultramarines
i am so bummed....does that mean it makes LRP FE 60 became useless when I used Blot powder to take the shine away? |
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Tue Aug 09, 2005 9:20 pm |
Hi Mithai,
No, not completely useless but the protection would be compromised. Not to mention degraded sunscreen actives may general free radicals. |
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