The distinction matters for both safety and legality
The effects of a single B12 injection typically last one to two weeks, though this varies depending on your baseline levels, metabolism, and overall health
Pfizer Bacteriostatic Water for Injection, USP is a sterile, nonpyrogenic preparation of water for injection containing 0.9% (9 mg/mL) or 1.1% (11 mg/mL) of benzyl alcohol added as a bacteriostatic preservative. It is supplied in a multiple-dose container from which repeated withdrawals may be made to dilute or dissolve drugs for injection. The pH is 5.7 (4.5 to 7.0)
No problem was found, however, with a widely-sold dark chocolate bar, which also had a good amount of potentially beneficial flavanols
Sermorelin and CJC-1295/Ipamorelin are growth hormone-releasing peptides that stimulate the pituitary to produce its own GH supporting body composition, recovery, and sleep quality