Buy eutylone ku crystal online is a synthetic substance created in the 1960s. It falls into the category of designer drugs, meaning it 8217 made to mimic the effects of other drugs. It& 8217;s known for its stimulating and empathogenic (emotion-enhancing) properties. Initially reported to authorities in 2014, it became more widespread internationally in 2019-2020 after the banning of a similar substance called ephylone.