Have read all that, and concur rather with Ghoul's point of view that aggregates are worth worrying about. In addition, had first-hand experience of spouse losing response to CJC-1295 after an eventual immune reaction, resulting in
lower IGF-1 levels than baseline (which is one of reasons we turned to HGH rather than GHSs). Whenever injecting a bioidentical or close mimic, probably pays to be extra careful not to trigger an immune reaction to one's native peptides(!) - and is the most commonly cited reason why the FDA rejects use of UGL peptides.
The cartridges, as typically used, may break all the rules to avoid aggregate formation:
- not filtered
- low-quality construction (particles, pH, etc.)
- not sterilized
- may encourage long storage time
Presumably, with pharma peptides/pens, those factors are all addressed (purer peptide, high-quality cartridge, sterilized, allowing longer storage times). Personally, I figure I'm taking enough of a risk with cheap UGL HGH that I don't want to add to that with less-than-optimal handling, but am also happy to see others experimenting with refillable pens, which will probably result in better cartridges.