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Question: how does sunscreen affect these outcome ? I have been in a UV-high indexed area for over 2hrs a day under sun and wondered if applying sunscreen every

Question: how does sunscreen affect these outcome ? I have been in a UV-high indexed area for over 2hrs a day under sun and wondered if applying sunscreen everyday as I have to exposed parts such as arms and legs have negative consequences since all of them have benzene. Now this seems to be another reason for not doing so?

arbol 4y ago
Not directly answering your question but related: "early sunscreen formulations were disastrous, shielding users from the UVB rays that cause sunburn but not the UVA rays that cause skin cancer. Even today, SPF ratings refer only to UVB rays, so many users may be absorbing far more UVA radiation than they realize." https://www.outsideonline.com/health/wellness/sunscreen-sun-exposure-skin-cancer-science/ https://www.outsideonline.com/health/wellness/sunscreen-sun-...
- samename 4y ago
  How can you know if it does both? Look for UVA on the bottle?
  - mattlondon 4y ago
    The UK - and I presume Europe - has a star rating for UVA protection in addition to SPF. Some details here: https://www.nhs.uk/live-well/seasonal-health/sunscreen-and-sun-safety/ https://www.nhs.uk/live-well/seasonal-health/sunscreen-and-s... Tl;Dr - you want minimum 5-star 30 SPF for your daily cream.
    - collegeburner 4y ago
      Do people actually use sunscreen every day? I wouldn't think a little sun (well before a burn) is that likely to cause problems?
      - FullStackAda 4y ago
        I do. Aside from sunburns, sunscreen helps to prevent or delay photoaging and reduce inflammatory response to UV in the skin - meaning less acne, rosacea and hyperpigmentation. I use only European sunscreens with proper UVA protection.
      - Balgair 4y ago
        I do. But I live at a fairly high altitude. If I don't put on the sunny, I'll get a bad burn in ~15 minutes of being outside. That's short enough that mowing the lawn or taking a walk will burn me. I got tired of always having a bright red nose or arms that just hurt. So, now I just have a bottle sitting by the door and schmear some on before going out. Also stopped wearing sunglasses, as they make burns worse. Again, I live at altitude.
      - mattlondon 4y ago
        Yes the recommendation is SPF15 every day, even in winter. Many daily moisturisers will have at least SPF15 so it's no hardship since you're already moisturising every day anyway.
  - shard 4y ago
    Look for PA+++ ratings. You might have to buy sunscreen made outside the US, such as sunscreens made in Korea.
  - jvanderbot 4y ago
    Zinc Oxide does. Kid sunscreen is almost always zink oxide to prevent hormone disruption from the nasty stuff they put in adult sunscreen. The term "broad spectrum" is used to denote UVA/UVB protection in the US, and is an FDA-regulated term.
clumsysmurf 4y ago
Under these conditions, I would recommend a UPF 50 garment, like Columbia PFG Terminal Tackle Hoody (but I have seen George aka Walmart for $10). I think this is safer than applying chemicals. Also sunscreens in the US are far behind the EU and Asia https://www.theatlantic.com/technology/archive/2022/07/us-sunscreen-ingredients-outdated-technology-better-eu-asia/661433/ https://www.theatlantic.com/technology/archive/2022/07/us-su...
sooheon 4y ago
UVB exposure -> p53 activation -> downstream sex hormones upregulation is hypothesized to be mechanism, so sunscreen that blocks UVB will probably reduce the effect. This study is part of an interesting trend I'm seeing of studies finding beneficial health effects to well timed, full spectrum sunlight exposure. The circadian benefits of seeing early morning sun every day (and darkness every evening) are well known. What's more surprising is that even UV exposure is not purely negative, and in the context of sunlight in moderate amounts (not to the point of acute sunburn) may be beneficial for health: https://doi.org/10.1093/jnci/dji019 https://doi.org/10.1093/jnci/dji019 finds that high intermittent sun exposure actually decreases melanoma lethality. I.e. those who avoid the sun die more from melanoma. https://doi.org/10.1111/joim.12251 https://doi.org/10.1111/joim.12251 found in a study that followed 30k women over 20 years that more sun exposure was associated with reduced all cause mortality. I.e. those who avoid the sun, apply more sunscreen die more in general.
SnowHill9902 4y ago
Benzene? I really doubt that. Benzene is almost banned even at labs because it’s so insidious.
- shard 4y ago
  Not all sunscreen have benzene, but there have been some recalls because benzene had been found: https://www.nbcnews.com/business/business-news/banana-boat-sunscreen-products-recalled-benzene-detected-rcna40893 https://www.nbcnews.com/business/business-news/banana-boat-s... https://www.cbsnews.com/news/sunscreen-coppertone-benzene-recall/ https://www.cbsnews.com/news/sunscreen-coppertone-benzene-re...

arbol 4y ago

Not directly answering your question but related: "early sunscreen formulations were disastrous, shielding users from the UVB rays that cause sunburn but not the UVA rays that cause skin cancer. Even today, SPF ratings refer only to UVB rays, so many users may be absorbing far more UVA radiation than they realize." https://www.outsideonline.com/health/wellness/sunscreen-sun-exposure-skin-cancer-science/ https://www.outsideonline.com/health/wellness/sunscreen-sun-...

samename 4y ago
How can you know if it does both? Look for UVA on the bottle?
- mattlondon 4y ago
  The UK - and I presume Europe - has a star rating for UVA protection in addition to SPF. Some details here: https://www.nhs.uk/live-well/seasonal-health/sunscreen-and-sun-safety/ https://www.nhs.uk/live-well/seasonal-health/sunscreen-and-s... Tl;Dr - you want minimum 5-star 30 SPF for your daily cream.
  - collegeburner 4y ago
    Do people actually use sunscreen every day? I wouldn't think a little sun (well before a burn) is that likely to cause problems?
    - FullStackAda 4y ago
      I do. Aside from sunburns, sunscreen helps to prevent or delay photoaging and reduce inflammatory response to UV in the skin - meaning less acne, rosacea and hyperpigmentation. I use only European sunscreens with proper UVA protection.
    - Balgair 4y ago
      I do. But I live at a fairly high altitude. If I don't put on the sunny, I'll get a bad burn in ~15 minutes of being outside. That's short enough that mowing the lawn or taking a walk will burn me. I got tired of always having a bright red nose or arms that just hurt. So, now I just have a bottle sitting by the door and schmear some on before going out. Also stopped wearing sunglasses, as they make burns worse. Again, I live at altitude.
    - mattlondon 4y ago
      Yes the recommendation is SPF15 every day, even in winter. Many daily moisturisers will have at least SPF15 so it's no hardship since you're already moisturising every day anyway.
- shard 4y ago
  Look for PA+++ ratings. You might have to buy sunscreen made outside the US, such as sunscreens made in Korea.
- jvanderbot 4y ago
  Zinc Oxide does. Kid sunscreen is almost always zink oxide to prevent hormone disruption from the nasty stuff they put in adult sunscreen. The term "broad spectrum" is used to denote UVA/UVB protection in the US, and is an FDA-regulated term.

clumsysmurf 4y ago

Under these conditions, I would recommend a UPF 50 garment, like Columbia PFG Terminal Tackle Hoody (but I have seen George aka Walmart for $10). I think this is safer than applying chemicals. Also sunscreens in the US are far behind the EU and Asia https://www.theatlantic.com/technology/archive/2022/07/us-sunscreen-ingredients-outdated-technology-better-eu-asia/661433/ https://www.theatlantic.com/technology/archive/2022/07/us-su...

sooheon 4y ago

UVB exposure -> p53 activation -> downstream sex hormones upregulation is hypothesized to be mechanism, so sunscreen that blocks UVB will probably reduce the effect. This study is part of an interesting trend I'm seeing of studies finding beneficial health effects to well timed, full spectrum sunlight exposure. The circadian benefits of seeing early morning sun every day (and darkness every evening) are well known. What's more surprising is that even UV exposure is not purely negative, and in the context of sunlight in moderate amounts (not to the point of acute sunburn) may be beneficial for health: https://doi.org/10.1093/jnci/dji019 https://doi.org/10.1093/jnci/dji019 finds that high intermittent sun exposure actually decreases melanoma lethality. I.e. those who avoid the sun die more from melanoma. https://doi.org/10.1111/joim.12251 https://doi.org/10.1111/joim.12251 found in a study that followed 30k women over 20 years that more sun exposure was associated with reduced all cause mortality. I.e. those who avoid the sun, apply more sunscreen die more in general.

SnowHill9902 4y ago

Benzene? I really doubt that. Benzene is almost banned even at labs because it’s so insidious.

shard 4y ago
Not all sunscreen have benzene, but there have been some recalls because benzene had been found: https://www.nbcnews.com/business/business-news/banana-boat-sunscreen-products-recalled-benzene-detected-rcna40893 https://www.nbcnews.com/business/business-news/banana-boat-s... https://www.cbsnews.com/news/sunscreen-coppertone-benzene-recall/ https://www.cbsnews.com/news/sunscreen-coppertone-benzene-re...