or NRG-1 appeared as a research chemical in the UK after mephedrone was banned. Chemical companies supply NRG-1 in the form of white crystallized powder. The users who buy napherone say that the effects of this chemical product are similar to mephedrone. Napherone is a member of amphetamine family. Chemical companies that supply naphyrone say its potency is higher than those of similar substances (i.e. mephedrone) so you should handle it with care during your chemical research. Chemical suppliers advise the users be very careful with dosing of naphthylpyrovalerone and take much less of naphyrone that they used to with mephedrone or other research chemicals.