Any adult can buy Kratom online in the state of Illinois legally . In fact, you buy as much Kratom as you like, either wholesale or in bulk. To date, Illinois has no impending legislation regarding the legality of Kratom, either, so users don't have to worry about suddenly finding Kratom illegal to consume or purchase in Illinois.
In 2014, Illinois lawmakers did make it illegal for vendors to sell Kratom to anyone under 18 years of age–HB 5526. Kratom vendors selling Kratom to minors could be faced with fines and loss of their business license.