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Fri Jun 18, 2010 4:20 pm  |
Thanks Jakee...very useful and informative  |
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Born in 1952. Blonde, very good skin. A few noticeable wrinkles. |
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havana8
Moderator
 
Joined: 09 Sep 2005
Posts: 3451
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Mon Jan 31, 2011 3:20 pm |
Anyone else see this update? Thoughts?
NIH panel links Vitamin A in sunscreen to skin tumors
The NTP assessment, confirmed by its advisory board of 11 scientists from leading academic medical and industry research groups, found that when test animals coated with a mix of retinyl palmitate and skin cream are exposed to ultraviolet light, a major component of sunlight, the cream with retinyl palmitate has the perverse effect of stimulating the growth of skin tumors.
http://www.ewg.org/release/nih-panel-links-vitamin-sunscreen-skin-tumors
NTP Technical Report on the Photococarcinogenesis Study of Retinoic Acid and Retinyl Palmitate
http://ntp.niehs.nih.gov/ntp/about_ntp/TRPanel/2011/January/DraftTR568.pdf |
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Tue Feb 01, 2011 5:38 am |
| Thanks for the post. I had read that somewhere before but had completely forgot. I don't think any of my products contain that form of vitamin A but I will be double checking. Thanks. |
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barololover
New Member
Joined: 22 Jan 2011
Posts: 4
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Tue Feb 01, 2011 7:13 am |
| I was always told Vitamin A makes the skin more sensitive to sun because of exfoliation that occurs. Never made sense, to me, to put it in a sunscreen. |
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Tue Feb 01, 2011 7:24 am |
| havana8 wrote: |
| Anyone else see this update? Thoughts? |
I have not read any of it yet. What is interesting is that Dr. Fernandes (Environ) believes retinyl palmitate can be photoprotective, and there is at least 1 study that showed this! |
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havana8
Moderator
Joined: 09 Sep 2005
Posts: 3451
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Mon Feb 14, 2011 8:19 pm |
I thought that retinyl palmitate was photo protective too but now I am not so sure and find this from the article cited above concerning:
The NTP's December 2010 draft assessment summarizes a one-year cancer study that culminated more than a decade of research by the National Center for Toxicological Research (NCTR), jointly funded by the NTP and FDA. Since 2001 the center has published 17 studies and reviews on the toxicity and chemistry of retinyl palmitate on skin. These documents show that the chemical breaks down in sunlight to photomutagenic compounds, forms skin damaging-free radicals, and "[causes] events that affect a large segment of the chromosome" (Mei 2005, 2006; Xia 2006).
The NTP studied the effects of ultraviolet light exposure on test animals whose skin had been treated with vitamin A-laced cream. Scientists concluded that vitamin A hastened tumor and lesion growth and caused the number of skin lesions and cancerous tumors to proliferate. |
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