TGF-b is Transforming Growth Factor Beta is a Growth Factor just like IGF. It agonises cell types to proliferate/differentiate especially in healing/wound repair processes. Just like IGF-1 or GH or like peptides have ZERO bioavailability orally. These growth factors can only be utilized by injection. They will be broken down in your gut just like any other protein/peptide structure. The gut does not discriminate against proteins. If you take TGF or IGF orally they will be broken down into their respective amino acids or shorter pepetide chains (few aminos together). Done. Nothing else can happen here, guaranteed.
As for the bit about TGF increasing the body's ability to absorb IGF-1. It makes no sense whatsoever if you know anything about what these growth factors are, their physiology and their method of action. Complete and utter BS, sorry to be so blunt.
Don't get me wrong, it is great to be interested in things. It's just that you have to approach it with common sense and understanding of the basic processes as well as learning about what these things are.
Just because someone says something especially a manufacturer does not make it true. You can't just blindly say "well that sounds good", if you have not actually learned about the topic being discussed. Thats how people "pull a fast one" on others... Thats how manufacturers often prey on the laymen's ignorance of the topic at hand. ...
This forum is dedicated to Growth Factors on a very profound level and I would trust the knowledge in here as it pertains to this field.
My 2 cents.
Take Care.