I read something a while back, I wish I could find it but alas I can't, that stated due to the nature of the peptide fragment it cannot bind to properly without the rest of the protein chain so that it was pretty much useless.
I have read so many mixed results with it I can't make a solid opinion on it, I will however not be doing any testing on it until further results come back.
For now, I'd advise not bothering with it.