Long R3 IGF-1 has been studied and used for many years as a growth-supporting supplement in serum-free and reduced-serum media, including in industrial mammalian expression systems, where the practical questions are how much of it survives in medium over a culture cycle, whether it can substitute for insulin at far lower molar input, and how it interacts with the binding proteins that cells themselves secrete into conditioned medium
Well-designed scientific investigations seem to suggest so
Quality and Safety Standards As a medical practice, patient safety and efficacy are our top priorities
Application The study used the modified GPx-DTNB assay to test animal tissue homogenates for GPx activity
The two are complementary and non-redundant: GHK-Cu for dermis and adnexae, BPC-157+TB-500 for deep structures (tendons, ligaments, muscles, gut)
Cell and tissue research , 377 (2), 153-159