I've definitely had a systemic itch with one "generic" I used without any site specific reaction.Yes but my comment was specific to site reactions caused by HGH not the bac water used or the BA it contains.
I've read the clinical dosing guidelines from the endocrinologist society and there is no mention of immunogenicity testing.
Unless there is a sub standard response in terms of IGF1 levels they wouldn't bother testing for immunogenicity unless there was a site or systemic immune response and BA was eliminated as the cause.
So my point is from a practical perspective the aggregates and the immune response they cause will generally be a site response and in rare cases a systemic reaction.
If the HGH molecule is misfolded it won't trigger an increase in IGF1.
That's why I recommended testing for non neutralising and neutralising antibodies. Unless I'm missing something that in combination with purity and contaminate testing should be sufficient...
I'd imagine host cell proteins also need to be considered.

