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"No reported side effects in limited research" is not the same as "safe." Anecdotal reports from the research community sometimes mention transient effects such as injection-site irritation, mild nausea, fatigue, or lightheadedness, but these are not from controlled trials and cannot be reliably attributed to the peptide

The drugs have made their way into doping cases in track and field, cycling and soccer and eventually into neighborhood gyms, where weightlifters and other hardcore hobbyists have an unproven faith that peptides help with everything from tanning, to life extension, to enhancing sexual performance, to building muscle and healing sports injuries

Vitamin B12 injections contain a synthetic form of vitamin B12, usually given via a muscle

10.1083/jcb.200705180 56 ReddyA

Vitamin B12 injections can help increase energy levels, and keep red and nerve cells healthy