Two severe anaphylactic reactions in July of last year:
Two People Almost Died at RAADfest. We Went to the Experts.
Two people nearly died, and several more sought treatment, after receiving peptide injections at the last RAADfest in Las Vegas.
lifespan.io
I do not know if those injections were by IM or subq, and we don't know which peptides (or combinations) were used with the two women.
A table by Gemini that includes the peptides mentioned in the article--"BPC-157, tymosine beta 4 (TB-4), and tymosine alpha 1 (Tα1)"--along with other peptides for comparison:
Regarding subq vs IM for gluta, MOTS-c, and GHK-Cu:
After a "virtual friend" of mine (who used to be very active here) recently had throat swelling after injecting MOTS-c by IM (with no history of such allergic reactions), I am distancing myself from the "community" (including GB groups) and from buying most non-GLP peptides.
Taking a baby dose whenever starting a new kit can mitigate some risk factors, but with IM, there is always a risk of the injection going into a vessel.
For epinephrine options, the Neffy spray seems more likely to be used before symptoms get worse.