Several peptides, such as delta sleep-inducing peptide (DSIP) and various growth hormone-releasing hormone (GHRH) analogs, are considered to stimulate deep sleep and improve overall sleep quality
This subjective improvement could reflect placebo effect, improved overall nutritional status from paying more attention to diet, natural adaptation to the medication over time, or actual b12 repletion if deficiency existed
Also, it boosts collagen production, smooths fine lines, and firms the skin
Some individuals report feeling more supported in their energy levels or overall well-being within a few hours to a couple of days after receiving the injection
Propheter DC, Chara AL, Harris TA et al (2017) Resistin-like molecule is a bactericidal protein that promotes spatial segregation of the microbiota and the colonic epithelium