Yes, that's one of the caveats of the medical profession. Different bodies react differently to different drugs.

And yeah, the pharmacological companies are making a lot of money on pills, but pills are important for combating diseases. They're not allowed to market pills unless they can actually scientifically show that they actually work for what they're advertising. I don't see how anybody with even a rudimentary understanding of medical science can honestly deny that isolated drug compounds in pill form can have profound health benefits when prescribed wisely. But that's the problem, too many people are scientifically illiterate. They couldn't tell a neutrino from a neutron star.

Why doesn't science fascinate people as much as it fascinates me?