Alongside goji berries, chia seeds are the superfood par excellence. Very healthy, high in omega 3 fatty acids, high in protein etc...
http://ernaehrungs-coach.com/9-grunde-regelmassig-chia-samen-zu-essen/

Unfortunately, you can only get the seeds in the drugstore at a very expensive price or online. By including this superfood (they also stock goji berries).... they would find healthy customers as a target group...