While the vitamins in a Myers' Cocktail are water-soluble and generally flushed out by your body, there's a theoretical risk of vitamin toxicity if excessively high doses are given, especially for those with compromised kidney function
Adverse effects on kidney, liver and nervous system, Nausea, Allergic responses, Rashes, Diarrhea, Stevens-Johnson Syndrome (rarely), Low levels of zinc (if supplements are taken for long), Bloating and cramping, and Breathing issues (in the case of asthmatic people)
Am J Physiol 246:E334338 Candow DG, Chilibeck PD, Forbes SC (2014) Creatine supplementation and aging musculoskeletal health
Peptide therapy is a cornerstone of the functional medicine model, offering a personalized approach to treatment
It may help preserve lean mass during calorie restriction, but it wont increase muscle size like full growth hormone or anabolic compounds