There is real science suggesting biological activity, but the clinical evidence is weak and conflicting
Use sterile water when no preservative is needed, or select 0.1% acetic acid, dilute HCl, or another suitable solvent based on the peptide's properties and intended use
Walter et al., 1996
References: [1] Huang T, Zhang K, Sun L, Xue X, Zhang C, Shu Z, Mu N, Gu J, Zhang W, Wang Y, Zhang Y, Zhang W
Department of Health and Human Services announced it was initiating a review process to consider removing a ban on the use of several of the most popular peptides
"Oral Vitamin B12 Supplementation After Roux-en-Y Gastric Bypass: a Systematic Review"