IGF 1 does lead to an increase in muscle hypertrophy , there is no doubt about that
Furthermore, in a pilot randomized clinical trial, Huang et al reported an improvement of in the 2-h glucose tolerance and systolic BP in after a 12-week treatment with taVNS in comparison with sham technique (Huang et al., 2014) (Table 1)
Subgroup analyses revealed important differences based on comparator drugs: GLP-1RAs demonstrated greater effectiveness than SGLT2 inhibitors in preventing MALOs (IRR: 0.93, 95%CI: 0.87-0.99, P = 0.043), than DPP-4 inhibitors in preventing hepatic decompensation events (IRR: 0.74, 95%CI: 0.66-0.83, P = 0.003), and than insulin therapy in averting HCC development (IRR: 0.32, 95%CI: 0.13-0.80, P = 0.033) [64]
Its also attracted a sizable amount of injury lawsuits in the U.S