What is the most expensive thing per Kilo on this planet ?

I think you will win for sure ,but what is it exactly :( 

Whatever the “new thing” is this week.

I remember my wife’s late uncle was in the latter stages of cancer, when he was prescribed a pill; what, I can’t say, but it cost $2500 each. That was 8 years ago. 

Extrapolate that out to a kilo, and I think we can both easily imagine that product’s name splashed across a NASCAR sponsorship. 

It's Botox ....it costs billions of £Pounds per kilo and the the most deadly poison known to man...an ounce or so will kill every living person on the planet 

Was it mustard gas that America first found out that could treat certain types of cancer...They actually use one type poison to reverse the effects of others ingested....

So typical of human nature. To place high value on something so capable of destroying us. 

That ,plus it must cost a lot to extract..
You can only extract vitiamin D from Lambs wool....it takes thousands of fleeces to extract a small jam jar full of the white powder.....the value of the jar full is between £300,000-400,000 pounds