A coffee powder marketed for weight loss contains amphetamines and should not be consumed, Medsafe has warned.
Elevacity Elevate Smart Coffee has tested positive for the stimulant phenethylamine - a class C controlled drug.
Phenethylamine can cause agitation, psychosis, cardiovascular effects like increased heart rate and blood pressure.
Medsafe has warned anyone who purchased the coffee powder should "safely dispose of it".
The powder was promoted through social media with New Zealanders directed to an international website for more information.
Medsafe says it does not recommend consumers buy things from social media without first exercising caution.
"The products may be marketed as supplements or coffee products promoted as assisting weight management, appetite suppression, or mood enhancement," said the warning.
"Product ingredient lists should be carefully reviewed and discussed with a health professional."