rayoflight
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I know there have been discussions in the past as to how much sunscreen someone should be applying to the face...I'm wondering what everyone's opinions are on moisturizer with SPF? How much moisturizer with SPF would I need to apply to my face in order to ensure the SPF is doing it's job?
Same amount as with "traditional sunscreen", 'cause the way I understand it, SPF and the other ratings (depending on where you live) depend on theoretical/practical test with the concentration of filters within the vehicle, whether it's a moisturizing cream or some ultra-thin liquid.
However, one thing I have noticed, often, not always, the combinations of moisturizers and sunscreens isn't very up-to date, meaning the moisturizers with built-in sunscreen relays on inferior filter combinations. For example, La Roche Posay has upgraded their Anthelios sunscreen line a couple times adding better filers and throwing out less stable ones, but the moisturizers with built-in sunscreens like Derm Ox or Rosaliac line still use filter cocktails I wouldn't trust as my only protection, even indoors. Also, moisturizers+sunscreens products tend to prefer chemical-only filters because they aren't whitening or otherwise unsightly, but that also means aren't as long lasting (photostable) as physical (zinc, titanium) or hybrid (Tinosorb M), meaning, unless frequently reapplied, moisturizer+sunscreen won't protect skin or protection with be partial = no good.
Consequently, I always use a "real" and trustworthy sunscreen, even if it's less convenient and I have a slightly visible layer of 'something' on my face. I feel I do get better protection and never get any color any more, so it work perfectly for me.
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