That's just informed consent verbiage.
If we take seriously (and bothered to read) all such things, we would never install a piece of software on our PCs. It is just a protection from litigation.
That being said, I agree that it is stupid to put anything in your body without a clear and compelling reason to do so. And it is stupid to put some chemical in your body because someone who benefits financially from it urges you to do so.
If a person has insomnia, I recommend Eliot Rosewater's panacea: an asprin and a glass of wine. [Have you read the warnings on asprin bottles, lately?]