Your B12 injection is administered intramuscularly in the upper arm or glute by your licensed clinician
The peptide looked fine, tested pure via mass spec for amino acid content, but showed no biological activity in cell culture assays
However, changes in your diet can change the color and consistency of your stools
People who use this mix of peptides are usually working with their doctors to achieve things like healing from injuries faster, reducing swelling, having skin and tissues be more comfortable, in their joints and helping their cells regenerate over time
And the other sources of peptides, which are gray market and black market, oftentimes do contain the same peptide that one would get from a prescription from a board certified physician, but very often they haven't cleaned out the Lipopolysaccharide
It is less invasive and more cost-effective for patients and clinics, especially those who do not provide infusions. You can view the full study here.