Ianto shakes his head, pushing himself up to stand and, after a moment, reluctantly pulling his gloves out of his pockets to slip back on again.

"Not specifically, no," he admits. "Just that it's quite strong and that it's sure to make you feel better, but that I'm not to let you take too much of it or to let you take it for too many days in a row."

He reaches back out to take the vial back from the other man, swirling the liquid in the glass before pulling out the stopper, making something of a face at the noxious smell that wafts from the vial once he does. "God only knows what it's actually made of, but as long as it helps..." He glances up at the other man questioningly. "I made sure they told me how to use it," he reassures, in case John's worried he's about to accidentally poison him.