 Participants will then be provided with one of the four supplements under investigation i.e. either a placebo or one of the preparations derived from tea to ingest as fluid along with a standard milkshake that provides participants with 40 g of fat, such that the appearance of this fat in the bloodstream can be measured. Of the 55 participants in this study, additional measurements will be made on a randomly selected sub-group of 15 to directly trace the appearance of fat in their blood samples; if participants have been asked and agreed to this part of the study then some of the fat in their milkshake would be a stable isotope tracer 13C-Tripalmitin. Participants will then rest comfortably, and a 10 ml sample of blood will be drawn from participants every 30 minutes for two hours, and at three hours, after consumption of the high fat drink. 