Bests & Worsts Reviews from Amazon

I used this product for several months and although it works well to adhere false eyelashes to eyelids, I won't be using it anymore. I read somewhere that Duo contained formaldehyde whereas Ardell adhesives did not. That is incorrect! On the box and also on the tube it clearly states "Contains Formaldehyde". Formaldehyde has been classified as a known human carcinogen (cancer-causing substance) by the International Agency for Research on Cancer and as a probable human carcinogen by the U.S. Environmental Protection Agency.