Most unique ingredient you've tried

Not sure how it benefits me but.. Idebenone

I think mine is micro algae

I tried Crocodile oil! Errrr not really my cup of tea and it’s hella expensive too! Its about 200-300$ per bottle.

Not sure whether it is true or just a marketing trick but Alpine Glacial Clay in a cleanser from Pond's is by so far the most unique ingredient I have ever tried. Unfortunately, the variant is already discontinued, at least in my country.

mine would be algae derived retinol alternative