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How to find PPD-does LRP Anthelios L really have PPD 15?
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Cautious newbie
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Sat Jun 02, 2007 8:38 am      Reply with quote
I've been reading all the posts...someone posted an MUA post that lists PPD levels for various sunscreens...I have NO IDEA how one determines the PPD levels for these things.

Anyways, she posted La Roche Posay Anthelios L as having a PPD level of 15...which is good enough for me!

Recently, Canada approved LRP Anthelios XL cream - but I tried a sample and it is way too sticky for me. The brochure, I think suggests, that this only has a PPD of 12?? I've heard the fluide is pretty good but the stores here aren't selling that one.

I much prefer the Anthelios L texture, but because it does not contain Meroxyl XL, I just assumed that the PPD level would be quite low and far less than the XL one of 12?

Now, I'm all confused because MUA says Anthelios L has PPD of 15...which means Anthelios XL must be much higher. How can I verify this for myself?

For the minimal exposure I get 15 PPD is good enough for me if I could just confirm that "L"
really has that much protection.

Any help please?!

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Cautious newbie
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Sat Jun 02, 2007 9:35 am      Reply with quote
I realized that I need to be more specific.

I am asking about the SPF 60 Anthelios L and the SPF 60 Anthelios XL cream.

Thanks.

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Sun Jul 29, 2007 4:26 pm      Reply with quote
I feel like an absolute idiot asking this - but was is PPD? Embarassed

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Mon Jul 30, 2007 1:58 am      Reply with quote
Cautious newbie wrote:
I realized that I need to be more specific.

I am asking about the SPF 60 Anthelios L and the SPF 60 Anthelios XL cream.

Thanks.


http://www.laroche-posay.com/_int/_en/index.aspx

There is an Anthelios XL fluide extreme spf 50+, isn't that what you are looking for?

I think you must be referring to some out of date information, since spf 60 no longer exists in Euro sunscreens. The new ones are all spf 50, 40, and 20, and the fluide has a ppd of 17 and the cream a ppd of 38. hth!

--avalange

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Mon Jul 30, 2007 7:25 am      Reply with quote
gottaHAVEitALL wrote:
I feel like an absolute idiot asking this - but was is PPD? Embarassed


After a bit of research on Google, I found the answer to my own question. I'm posting what I found here for those who may have the same question I did... I also posted some info on IPD. HTH!

Source: http://sun1.awardspace.com/Sunscreens/Standards/Standards.htm

Persistent Pigment Darkening Method (PPD)

Sunscreens with high PPD ratings do the best to protect those of us with extreme sun sensitivities against UVA light. So assume we want sunscreens with UVA ratings with a PPD greater than 15.

Persistant Pigment Darkening (PPD, UVA-PF)
The Persistent Pigment Darkening (PPD) method is a method of measuring UVA protection, similar to the SPF method of measuring UVB light protection. Theoretically, a sunscreen with a PPD rating of 10 should allow you to endure 10 times as much UVA as you would without protection. People are irradiated with a UV-A light source (320 to 400 nm). Two or three hours after irradiation with UVA, the skin has changed yielding a persistent pigment darkening. The advantage of the persistent pigment darkening is that the residual colour that has developed after exposure to the radiation allows a more precise reading to be taken. They compare the sunscreen protected (MPDp) skin and the unprotected (MPDu) skin to determine the results. The results were expressed as UVA-protection factors UVA-PF. [Tinosorb] [Nora80] [Ciba]

The PPD response is stable and reproducible; however its clinical significance is questionable, because the action spectrum for PPD is not defined for wavelengths shorter than 320 nm, and the response is masked during outdoor sun exposure by other skin responses to UV. Thus it is impossible to relate the PPD protection factor directly to the degree of protection is sunlight. [Stanfield]

Immediate Pigment Darkening, IPD
The immediate reactions induced by UVA radiation on the skin surface are an immediate darkening of the pigment and the appearance of a low intensity erythema hidden by the pigment.The appearance of an immediate pigment darkening is relatively easy to detect on subjects with a type III or IV phototype.This phenomena does not even show up on subjects with a I or II type phototype and is frankly difficult to see on individuals with a dark phototype.The immediate pigment darkening that develops after exposure to UVA rays does not really allow a precise reading to be taken.

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Mon Jul 30, 2007 11:10 am      Reply with quote
I bought the LRP Anthelios XL cream at Shoppers too and used it for one day. Totally hated it since I'm so used to wearing Sofina sunscreens. It's so thick and sticky I'd never bring myself to wear it religiously!

I read on MUA they estimated the PPD using a chart on someone else's notebook. I'll post again when I find it.
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Mon Jul 30, 2007 6:29 pm      Reply with quote
it's on the notepad "sunscreens." quite a good one, i think.
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Mon Jul 30, 2007 9:35 pm      Reply with quote
Yes, the PPD number is located on sunscreen's notepad, but she states in it that she used some other members PPD chart to get her estmated numbers...I remember I read through her ENTIRE notepad and sunscreenfaq to get to yet another notepad!!! It was quite the learning process!
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