Mytraginine is the main alkaloid in Kratom. But Kratom also contains many others in smaller amounts at least one of which can have a significant effect on the user (7 Hydroxy mytraginine). Full spectrum means they have extracted all the alkaloids from the plant. Mytraginine enhanced means they only extracted mytraginine and added SOMETHING. This something is most likely to be an unregulated opioid that is supposed to enhance the effects. Most kratom users will tell you to avoid extracts an