A paste-like concentrated Kratom extract can be prepared by boiling of a quantity of fresh or dried Mitragyna speciosa Kratom leaves, which is then lengthily evaporated by boiling down, until the liquid is reduced to a concentrated tar / resin like extract, which can be stored for later use.

Small pellets of this Kratom extract can be swallowed, or they can be dissolved in hot water and consumed as a Kratom tea. The effect of the Kratom extract are said to take longer to take effect, and also to last longer than plain leaves. Good Kratom resinous extracts can have full spectrum alkaloid concentrations of over 41%.