This randomized clinical trial demonstrates that vitamin B12 supplementation, alone or with folic acid, significantly improves blood sugar control and insulin resistance in patients with type 2 diabetes.
However, there is considerable individual variation, and many patients notice little change initially
You might have to pay some money out of pocket
Tightened skin makes it easier to insert the needle at the correct angle

If you want the broader landscape (and the list of other peptides driving search interest), see Metos internal piece: 14 Peptides Are About to Become Legal Again What This Means for Your Health. Who should consider AOD-9604 (and who shouldnt) Consider it only if your expectations are realistic AOD-9604 may be worth a conversation if you are: Already doing the fundamentals (protein, resistance training, sleep) Not seeking massive scale weight loss Looking at fat-loss support rather than appetite suppression Intolerant of GLP-1s and exploring alternatives (with the understanding that alternatives are usually less powerful) Avoid it if You have significant obesity and need a high-efficacy therapy (GLP-1/GIP class is typically far more impactful) (PubMed) Youre hoping it will melt fat without dietary alignment Your plan depends on unverified sources or research peptide suppliers Youre in a drug-tested sport environment (WADA prohibition is relevant) (wada-ama.org) Practical expectations (what most people want to know) How fast does it work

B12 Shots aren't directly associated with weight loss