Reflex nutrition one stop xtreme shake is a comprehensive and all in one body building protein shake suitable for hard gainers and those looking for extreme mass gainr reflex nutrition body building shake is one of the worldrsquos best sports supplements in research based doses all delivered in one easy to use shake using only the highest quality of ingredientsr reflex nutrition one stop xtreme all in one provides an impressive 55g of quality whey and micellar casein protein and 73g low g