"No, it works like it but it's not. Like," really, Clint wasn't sure how to explain it. He knew a few agents who'd been given a dose of the formula after particularly harrowing missions or the likes. "The whole point of it is to work in conjunction with the serum, it's not a substitute for it. Without the serum, the Infinity Formula doesn't work."
As far as Clint knew, Fury was in his late sixties, but he had the appearance and the abilities of a man in his forties. To him, it added up to a little enhancement. "You know I'm being entirely facetious when I call him 'ancient', right?"