You can do this by feeling along the injection site, as well as along the belly below the site of injection, as fluids tend to pool along the cat's underside
PMID: 34377956
Oral and sublingual B12 supplements are readily available, but the general consensus is that intramuscular injections of B12 are the most effective and efficient means of delivery
BPC-157 is one of the easiest peptides to self-administer
DOI: 10.1158/1055-9965.EPI-17-1136 Morales-Gutierrez J et al, "Toxicity induced by multiple high doses of vitamin B 12 during pernicious anemia treatment: a case report." Clinical Toxicology, Feb
[1] [3] The ingredients of Ascorbic Acid (Vitamin C) Injection are ascorbic acid as the active ingredient, with water for injection as the vehicle, and, in the preserved formulation, a suitable preservative to maintain sterility and stability during multi-dose use