Methylene blue

There are a number of candidates for humanity’s greatest advances. The control of fire 400,000 years ago may be at the top of the list, because fire provided warmth, cooked food, and the ability to smelt metals from ores. 

Methylene blue is a hashtag paradise on TikTok, where 5,500 #bluetongue videos were posted. Why? Ignoring the normal idiocy seen on the site there are all kinds of claims that it does wonders for [you name it].

Contrary to populist dogma, with rare exceptions, chemicals do not accumulate in our bodies.