Comments on: Do zinc sunscreens stop working and go toxic after 2 hours? https://labmuffin.com/do-zinc-sunscreens-stop-working-and-go-toxic-after-2-hours/ The science of beauty, explained simply Mon, 28 Aug 2023 15:13:32 +0000 hourly 1 By: Michelle https://labmuffin.com/do-zinc-sunscreens-stop-working-and-go-toxic-after-2-hours/#comment-176655 Thu, 25 Nov 2021 03:06:39 +0000 https://labmuffin.com/?p=11658#comment-176655 In reply to Stephanie.

Just when you mix two sunscreens together yourself.

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By: Alicia https://labmuffin.com/do-zinc-sunscreens-stop-working-and-go-toxic-after-2-hours/#comment-173683 Wed, 17 Nov 2021 21:37:40 +0000 https://labmuffin.com/?p=11658#comment-173683 I just wanted to thank you for writing this and for ALL the information you share (I also follow you in YouTube).

When I heard about the study, I panicked and went out and purchased the La Roche Posay Anthelios (I’m in the US so our sunscreen choices are behind the times). I have rosacea and eczema and sunscreens with chemical filters really sting when applied and cause flares and dermatitis as well. I knew this, but was also worried about skin cancer and my rosacea flaring from insufficient UV protection because Zinc Oxide sunscreens are the only ones that don’t sting and burn for me. Of course, I wound up with a miserable reaction (that my derm has been treating) when I switched to the La Roche Posay.

Thank you SO much for making me feel comfortable going back to what’s really my only option for sun protection. The one I use is loaded with silicones so the ZO is presumably NOT uncoated. Yes, it’s an inelegant formula and is basically clown makeup and very thick, but it stays on, has 20% zinc, and I can buy it at a local store for only $9.99 US for four ounces. I do reapply like crazy so more expensive isn’t an option.

THANK YOU for sharing your expertise. I can’t tell you how grateful I am to know there’s an option for me that doesn’t burn my skin off.

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By: Stephanie https://labmuffin.com/do-zinc-sunscreens-stop-working-and-go-toxic-after-2-hours/#comment-173578 Wed, 17 Nov 2021 17:08:19 +0000 https://labmuffin.com/?p=11658#comment-173578 Does any of the information here apply to 100% mineral sunscreens or just chemical mixed with mineral?

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By: Michelle https://labmuffin.com/do-zinc-sunscreens-stop-working-and-go-toxic-after-2-hours/#comment-165028 Thu, 28 Oct 2021 13:17:53 +0000 https://labmuffin.com/?p=11658#comment-165028 In reply to Lily.

I have a few listed here: https://labmuffin.com/my-favourite-sunscreens-2021-update-with-video/

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By: Anne https://labmuffin.com/do-zinc-sunscreens-stop-working-and-go-toxic-after-2-hours/#comment-162318 Thu, 21 Oct 2021 21:08:11 +0000 https://labmuffin.com/?p=11658#comment-162318 Good thing I never was a fan of layering sunscreens. The only time I could think of doing it is when I reapply in the middle of the day, but by then the filters of the first one have most likely already degraded/ been rubbed off, so I don‘t think that will be much of an issue. And I tend to go for SPFs with chemical filters anyway.

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By: Lily https://labmuffin.com/do-zinc-sunscreens-stop-working-and-go-toxic-after-2-hours/#comment-161978 Thu, 21 Oct 2021 10:18:22 +0000 https://labmuffin.com/?p=11658#comment-161978 Thanks for the informative blog! I was a bit confused about this study. Since you seem to prefer chemical sunscreens over zinc based, are there any zinc based ones you do like and think work? I prefer zinc based sunscreens if possible.

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By: Diana https://labmuffin.com/do-zinc-sunscreens-stop-working-and-go-toxic-after-2-hours/#comment-160874 Mon, 18 Oct 2021 19:07:44 +0000 https://labmuffin.com/?p=11658#comment-160874 I love to dabble in all different kinds of sunscreen. So I am one of those rare cases who might have a layer of uncoated zinc oxide sunscreen (babo botanicals sheer zinc) in the morning, then reapply with a chemical sunscreen in the afternoon (Allie extra uv gel). Now I won’t be doing that anymore! Thank you for this informative blog post.

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By: Carolyn Allen Russell https://labmuffin.com/do-zinc-sunscreens-stop-working-and-go-toxic-after-2-hours/#comment-160377 Sun, 17 Oct 2021 19:22:31 +0000 https://labmuffin.com/?p=11658#comment-160377 I’m so happy to see your response! I was definitely worried when I saw all the headlines, but I kept telling myself to wait to make any changes until after you inevitably posted something 😉 So thank you for being such a wonderful resource!

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By: Maria https://labmuffin.com/do-zinc-sunscreens-stop-working-and-go-toxic-after-2-hours/#comment-160343 Sun, 17 Oct 2021 15:51:38 +0000 https://labmuffin.com/?p=11658#comment-160343 Do you think this would also apply to using a chemical sunscreen (avobenzone free) then using a makeup product on top? Such as a tinted moisturizer with zinc oxide. In that case is it important to use a matching filter in both the sunscreen and makeup product?

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By: Cynthia https://labmuffin.com/do-zinc-sunscreens-stop-working-and-go-toxic-after-2-hours/#comment-160105 Sun, 17 Oct 2021 01:42:01 +0000 https://labmuffin.com/?p=11658#comment-160105 What about using makeup that contains zinc oxide on top of chemical sunscreen ? Thanks

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