Odds are the amount of aggregated, inactive rHGH, unless it looks like milk, isn’t more than 10%, more likely low single digits. Worst case scenario I’ve seen are scientists using very high heat getting about 30% loss via aggregation. Since most are overdosed I don't think any dose adjustment needs to be made.
As far as “is it ok to inject after filtration?”.
For my risk tolerance yes.
Aggregates need to fall within a certain “looks like bacteria!” size range for the immune system to react and cause immunogenicity.
Thats 0.1 µm to 10 µm.
Aggregates must be at least 100um in size to be visible by the way, so relatively huge. (Those large aggregates cause other issues, but I’m focused on immunogenicity as the biggest threat).
So a .22um filter is removing 99% of the aggregates in the immunogenicity triggering size range. The small amount left is probably on par with the levels found in pharma (or even less, to be honest).
This experiment was conducted by one of the worlds leading experts on peptide pharmaceutical development to demonstrate why even pharma peptides / proteins should be filtered, in part, to avoid immunogenicity causing drugs to become less effective:
Here’s the result of pharma* rHGH filtered with .22um PES syringe filters, the same type I use.
From 37,000 >1um sized particles / ml down to about 300.
View attachment 357594
This was expired rHGH, and shaken, to simulate worst case scenario of what a patient might be exposed to with poorly stored and handled pens. Pretty sure it’s safe to assume UGL is always “worst case scenario” condition.
So knowing filtering completely neutralizes the aggregate threat, and the cumulative harm from all the other shit found in cheap vials being injected on a daily basis,
View attachment 357596View attachment 357595
along with guaranteeing sterility since Jano found a high proportion of peptide vials containing bacteria, a shock, I know, when most are likely produced in peptide labs like this one:
View attachment 357597
that doesn’t make UGL peptides risk free, but lowers it enough to make it tolerable for me.