b12 injections in the stomach Vitamin Injection Sites: All You Need to Know How to Give B12 Injections
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doi:10.1080/14017431.2024.2441112 Jain H, Patel N, Erum M, et al

In addition, push out a tiny amount of solution to ensure there is no air left in the metal tip

Always speak with your doctor before using peptide-based treatments or supplements
How do peptides and liposuction work together

So the 100% figure is an assumption from how systemic administration generally behaves, not a measured number for this compound
