It was previously available through compounding pharmacies as a bulk drug substance, but the FDA reclassified it as a Category 2 substance, which effectively restricts compounding pharmacies from producing it
Additionally, IGF-1 stimulates the synthesis of neuronal RNA and promotes the formation of axons, the long projections of neurons that transmit nerve signals (Dyer et al., 2016)
But thats a whole other story for another article
It also directly supports collagen synthesis, making it one of the few ingredients that genuinely addresses both brightness and firmness in the same step
"They lose weight, which is a positive thing," says Warren Yacawych of the University of Michigan, "but they experience such severe nausea and vomiting that patients stop treatment." So at this year's Society for Neuroscience meeting in San Diego, Yacawych and other researchers held a session to describe their efforts to understand and solve the side-effect problem