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Thu Feb 01, 2007 11:20 am  |
Titanium dioxide vs. Zinc accordiing to UV Natural:
"Nano Particles - Is there something I should know?
Recently there has been a flood of questions relating to the safety of nano particles. In other words, should you be concerned? The answer is yes. Some nano particles are extremely active and dangerous to the cell BUT not all. It is important not to get caught up in the hype and wave of fear and panic. The only way to be sure is to read broadly and arm yourself with information.
Nano Zinc and nano titanium are often (mostly) grouped together and this is unfortunate as they behave differently. Titanium is toxic to the cell whether it is macro, micro or nano; zinc is not. Titanium is photoreactive (produces free radicals and damages DNA) whether it is coated or uncoated whereas uncoated zinc is slightly photoreactive BUT coated zinc is NOT.
It should not surprise you at all to learn that UV natural uses coated Zinc only. The zinc used in UV Natural does not penetrate into the bloodstream and affect serum zinc levels."
http://www.uvnaturalusa.com/htm/whats-new.asp
This is from one of their doc. downloads: (Nano zinc Vs nano Titanium.)
"I have scoured the documents available on this matter and I have made the following findings:
1. The two ingredients, Titanium Dioxide and Zinc Oxide are often collectively referred to in the heading, introduction and summary of the various articles yet the damming data regarding toxicity in the main body of the document refers to Titanium and not Zinc Oxide. They seem to be referred to collectively as they are both prominent sunscreen ingredients, yet they behave differently as nano particles.
2. The various “tidbits” of information on the internet seem to loop amongst each other referring to the same body of articles and then using each other’s sites as sources of reference. In essence the same thing is being said without any new information, just more people are quoting each other from the same document.
3. Titanium Dioxide is toxic at the macro and nano level whereas Zinc oxide is not. Zinc is in fact required by the cell for a number of essential functions and the cell would die rapidly without it.
4. Titanium Dioxide, coated or uncoated is photoreactive, coated Zinc oxide is not.
5. Titanium Dioxide is not a true physical sunscreen, it absorbs 70% of UV light and only reflects 30% whereas coated Zinc Oxide reflects much closer to the 100% range and is a true physical sunscreen.
6. Coated Zinc Oxide is NOT photoreactive and therefore does not product hydroxyl ions (free radicals in question) whereas uncoated Zinc oxide and Titanium Dioxide, coated or uncoated do.
7. UV Natural uses coated Zinc oxide.
8. UV Natural chose its ingredient list very carefully and we avoided the common sunscreen ingredients due to their toxicity.
UV Natural continues to research and develop new products with a constant vigil of using safe ingredients. We maintain an awareness of current research and data on toxicity issues and develop our products in line with information available at the time."
Still have not heard back from ISC. |
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