[analog31]

An antibody is a protein. The acid in your stomach will break down the molecules into their constituent amino acids, which would be absorbed into your bloodstream. The chance that the antibody would have any biological effect before being broken down is slim. Still there are other reasons for not drinking it such as whatever else is in the solution such as preservatives etc.

[meindnoch]

What if I injected it?

[analog31]

Your insurance will probably deny it, and you'll get a bill. ;-)

My guess is possibly not much, but it could vary greatly from one antibody to another. If the antibody isn't specific to any human protein, then it'll probably end up in your pee eventually. On the other hand, there are therapeutic proteins that are given by injection, so I could hardly suggest that it's intrinsically safe. And antibodies made for medicinal research stand a good chance of existing because of possible human interaction.