It is normal and not a sign of contamination
Peptides with sequences rich in hydrophobic residues, or those with a high proportion of basic amino acids (lysine, arginine, histidine) that require protonation for charge-mediated aqueous solubilisation, typically reconstitute cleanly and completely in 0.1% acetic acid water whereas the same peptides may form aggregates, gels, or turbid suspensions when reconstitution with neutral sterile water or bacteriostatic water is attempted first
Benefits of B12 injections include the following: Might Reduce Depression, Cognitive Decline and Dementia: Some studies show that, especially in older people, supplementing with vitamin B12 can help prevent depression, restore better mood control and retain healthy memory/mental functioning
The peptide, Semaglutide, is a GLP-1 agonist