While the exact bioavailability of oral BPC 157 isnt fully established in human studies, anecdotal reports and preliminary research suggest that meaningful amounts do reach systemic circulation, particularly when taken on an empty stomach or via sublingual administration
Senescent Leydig Cell Elimination & Testosterone Restoration in Aged Mice (Aging / PMC, 2020) FOXO4-DRI Disrupts FOXO4-p53 in Senescent Leydig Cells and Improves Testicular Microenvironment A study published in Aging (and indexed on PMC) demonstrated that FOXO4 is specifically expressed in human Leydig cells, with nuclear translocation of FOXO4 in elderly men correlating with decreased testosterone synthesis
De Yang, Chen, Q., Schmidt, A.P., Anderson, G.M., Wang, J.M., Wooters, J., et al., J
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