Unseen behind the mask, Kylo smiles.
Slow. Satisfied. He holds out his hand, the oppressive weight of his attention shifting from the dealer to the item.

Even from what he's seen, he's confident these capsules will provide something. How much and for how long, it's hard to say. Maybe impossible, until he has the opportunity to provide Apollo with one to test the results.

"And a single dose is sufficient?"

These are apparently supposed to be for vampire hunting, after all.