Go back before they started writing the film and make sure that Stewart and Spiner have absolutely no input. Then go with Piller's idea of serium krellide as the basis for all Federation medical technology.
In fairness though, based on Piller's book, the first script was thrown out without Stewart ever seeing it. Berman rejected it based on what he thought the lead might
say, which is hardly Stewart's fault. If anything he seemed to have brought it back closer to the original idea.
Yeah, it was painful reading about that. Stewart would have liked the original draft, but they simply threw it away without ever showing it to him. And when the said he liked the Fountain of Youth story, they never returned to the original draft.