I invest my own resources in researching and creating content for my blog. I have to admit this is quite a geeky blog and if anyone has any questions, drop me a line at or leave a comment! (I have assumed Octocrylene at 2x Avobenzone to stabilise Avobenzone). As you can see from the graph above, absorbance is better when Avobenzone is 5% and the PPD is also higher at the larger percentage.
The area under the curve represents UVA absorbance and the larger the area under the curve the better. Is there a difference between the level of protection offered by Avobenzone at 3% and 5%? I would have to look at sunscreen to take a call.Less common stabilisers used are BEMT and DHHB.Octinoxate + Octocrylene + Avobenzone is a big NO (Octinoxate destabilises the Avobenzone and itself).Octocrylene must be > than Avobenzone, so appear before Avobenzone in ingredient list.Avobenzone must be present with a photostabiliser.How do I know if Avobenzone in a sunscreen is present in a photostable form? I hope you can agree that Avobenzone is the winner in each instance. The area under each graph represents UVA absorbance of the filter and the larger this area is, the more efficient the filter is and the higher the PPD. The above can be illustrated using the graphs below. As most of UV radiation that we are seeking protection against is UVA1, Avobenzone is here to stay. Why do so many sunscreens use Avobenzone?ĭespite its major drawback (i.e., its photounstable), Avobenzone provides superior protection against UVA1. Some will provide photostability to Avobenzone, especially BEMT.Have a synergestic effect on protection against UVA.Do not need to be present in massive quantities to be effective (e.g, Even 1.5% DHHB gives PA++ rating, assuming no other filters are present).Large in size (all are >500 Daltons, which in plain English means dermal absorption does not take place).The US FDA on Avobenzone writes: “Avobenzone’s efficacy decreases by 50% – 90% after 60 minutes of exposure to sunlight.” Photostable (do not start to breakdown as soon as they come out of bottle.Abbreviated to MBBTĪpart from Avobenzone, the remaining filters are “new style” filters, whose characteristics include: Methylene Bis-Benzotriazolyl Tetramethylbutylphenol (MBBT) (Tinsorb M).Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine (Tinsorb S).Diethylamino Hydroxybenzoyl Hexyl Benzoate (Uvinul A).Butylmethoxydibenzoylmethane (Avobenzone).These are the INCI and (common names) of these filters: These are names of UVA sunscreen filters. We want UVA filters to protect against the following damages: What are Avobenzone, Uvinul A, Tinsorb?
AVENE SUNSCREEN TINOSORB SKIN
The EU defines “UV filters” is substances which are exclusively or mainly intended to protect the skin against certain UV radiation by absorbing, reflecting or scattering UV radiation. Would love to hear your thoughtsīefore I answer this quite technical question on sunscreen filters, I want to remind you that to get the best out of your very high UVA protection sunscreen, focus on these best practices: What do I want from UVA filters? Is avobenzone better at protection than univul a, I know it is unstable but just adding octocrylene make it 90% more stable. Their spf 50 sunscreen has Univul A, but a version specifically for pigmentation/dark spots has avobenzone as main ingredient. My concerns or general thoughts are the following, would be great if you could give me an answer: Can the PPD vary based on the ingredient, as in Can avobenzone at a concentration of 3 or 5 % itself provide a higher ppd than Univul A at 10 percent? I don’t know any info on that.My general observation is that for sunscreens that claim high ppd, they use avobenzone over univul a or tinosorb. The reader’s follow up query (via email) is this:
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