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Thu Jul 25, 2013 7:56 pm  |
So, Neutrogena's mineral sunscreen is 4.7% and 4.9% zinc oxide/titanium dioxide. It is rated as an SPF 50. Burnout is 18.6% and rated as SPF 30. Coola's face sunscreen is 3.2% titanium dioxide and 1.8% zinc oxide and rated as SPF 30 (yet Burnout has much higher ZnO and same...?). Some Shiseido SPFs with 15-ish % zinc oxide (AND chemical filters) have SPF 50. Topix SPF 50 has 13.75% zinc oxide.
At face value, for instance, shouldn't Topix (13.75% ZnO) have a lower SPF than 50 because Burnout (18.6% ZnO) is SPF 30? In both of these formulas, zinc oxide is the only sunscreen filter.
The list goes on and on. HOW can manufacturers get away with that low of titanium dioxide/zinc oxide (aside from Burnout, Topix, CeraVe face, Shiseido, etc)?? Particularly the Coola one... I see instances like that all the time! Super low amounts of physical sunscreens yet they get rated as that high of SPF?
Can anyone enlighten this issue because it seems to be an enormous disservice to customers who simply want good sun protection.
Even worse is when a product has 3-5% titanium dioxide and are advertising as "broad spectrum"; titanium dioxide doesn't even cover the whole UVA range, let alone at such a low amount! |
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Thu Jul 25, 2013 8:11 pm |
hi usa4040 , this issue has been raised before but we no pro formulators here so no one could answer this... sunblocks are considered a drug and are FDA regulated though so companies cannot just lie..
but, spf 15 provides 97% protection and spf 30 provides 99, I think... anything above provides a minimal more.. also spf is only for UVB.. if u use physical sunblocks, especially ZnO, they ll protect from both... also using sunblock should not give sense of 100% protection, prolonged sun expo is best to be avoided.... imo |
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Fri Jul 26, 2013 9:17 am |
There are certain solvents and fats that add to a product's spf. The ingredients that do the most blocking are the minerals but other ingredients help. Also, the particle sizes of the tio2 or zno matter. With Zinc oxide, the smaller you get the worse the uva protection. The really tiny micron sizes are pretty much the same as titanium dioxide from what I understand.
I think that's the main factor. The particle sizes. |
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Fri Jul 26, 2013 2:48 pm |
I agree, many oils, like tamanu and squalane also increase spf value.. |
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| Thu Apr 25, 2024 6:17 am |
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