Squash is decided in the head as often as the hand. The player who keeps composure through a marathon third game beats the one who has the better drop but loses the plot. We wanted a provision that supported that composure honestly — a modest, well-balanced blend rather than a jittery stimulant dressed up as an edge.

The theanine takes the sharp corners off the caffeine; the citicoline and rhodiola do the quiet work of concentration and calm under load. We trialled it through a full club championship before stocking it, and it did precisely what the label promises: nothing dramatic, everything steady.

— The dispensing bench, Nick & Tin