My doctor recommended me to take Oscillococcinum when I get the flu symptoms. I bought anas barbariae from Similsan. It helped the same but for ten times less. It is not allowed in Switzerland anymore so I was very happy to find that Hyland's also has a product which contains anas barbarieae. For many years I have not had the flu. I used to get the flu each winter. Every time somebody used to sneeze or cough I got ill. Now I take a few tablets at the first symtoms and they dissapear within a very short time. It also helps my daughter. And it has absolutely no side effects. I can only highly recommend it.