The amylin pathway adds satiety more than it adds nausea which is the relevant data point for the reta+cagri layering question
Researchers believe its potential benefits may stem from effects on oxidative stress, inflammation, and insulin sensitivity.13 Recent meta-analyses have reported improvements in several metabolic markers, while newer clinical studies suggest NAC may also support ovulation-induction outcomes in some women.20 21 People seeking fertility support Oxidative stress can affect both male and female fertility, which has led researchers to investigate NAC in several reproductive settings.32 In men, NAC combined with selenium has been shown to improve certain semen parameters.23 In women, NAC has been studied alongside IVF and other fertility interventions, with some research suggesting possible benefits for reproductive outcomes.24 Adults interested in healthy aging Interest in NAC has also expanded into healthy-aging research because of its role in glutathione production

However, Medicare Part D plans are unlikely to cover B12 shots or oral tablets since these plans do not typically cover vitamins or supplements
10.3390/antiox14091033 38 GuerraC.MorrisD.SipinA.KungS.FranklinM.GrayD.et al (2011)
A synthetic peptide derived from a naturally occurring protein, BPC-157 promotes angiogenesis, improves blood flow to damaged areas, and supports healing across musculoskeletal and gastrointestinal systems at the cellular level