biochemikerin

I've been told that Asian sunscreens contain sunblocking ingredients that are not present in US formulations. Do you have any opinion on these types of ingredients?

How exactly does the mitochondrial complex II enzyme work to keep skin looking smooth?

Why does my brown skin temporarily darken as a result of sun exposure (even while wearing sunscreen), but return to its original shade as soon as I get home and shower? Is it possible for a tan to be this temporary?

I didn't know that, any suggestions?

Right now I am using a Japanese product from the company Biore with SPF 50 PA++++; it dries clear. I have not had any accidental tanning issues with this one yet, but it is not sweatproof so I have to be careful to reapply. The one that gave me the most tanning issues was an oil-based chemical sunscreen product from L'Oreal-- I suspect I was sweating it off in the heat.

Thank you for your reply! I was just surprised that I can come home and the tan fades so quickly. It looks like I need to get better about re-applying sunscreen during the day!