The arginine substitution and extended N-terminus confer reduced affinity for IGFBPs, allowing greater bioavailability and receptor interaction
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it is sold almost exclusively as an unregulated "research chemical" labeled not for human consumption
by Chris Kresser [ Wu Y, Kajdacsy-Balla A, Strawn E, Basir Z, Halverson G, Jailwala P, Wang Y, Wang X, Ghosh S, Guo SW
Interestingly, this infection has also been connected to ankylosing spondylitis, an autoimmune condition that causes pain and fatigue