One hundred twenty men between the ages of 60 and 74 with symptoms of low testosterone were randomized to receive 160 milligrams orally administered testosterone undecanoate, 2 grams propionyl-L-carnitine plus 2 grams acetyl-L-carnitine per day, or a placebo for a six month period
But progress was slow and not much happened before Knudsen went on maternity leave (Gilbert, Rosenthal, March 2024)
Matsushita M, Freigang S, Schneider C, Conrad M, Bornkamm GW, Kopf M
This stem cell activation suggests GHK-Cu may help maintain the regenerative capacity of skin tissue
Several factors can increase your risk, such as a family history of thyroid cancer or past radiation exposure