So is medical science not "real science" because we've had quite a few stories over the last few years that a ton of results from medical research and drug trials can't be reproduced.
A large percentage of medical studies are funded by manufacturers, and it's fairly well understood that most of those don't get published unless they produce the "right" results. And those that are published are often really "preliminary", based on too little data to be considered reliable. But if a test on 10 or 20 patients gives the "right" results, there is a lot of marketing pressure to get the paper published right away.
This easily explains the growing problem of medical products that are found to be worthless (or even harmful) to the patients, after years of heavy marketing has produced large profits.
There's also the age-old problem that studies with "negative" results usually don't get published at all. As usual, there's a good xkdc comic that explains the methodology in a way that even the minimally numerate reader can understand.