Injecting L-carnitine into a specific muscle is likely to increase androgen receptor density in that muscle.

“It also has a unique effect-- well, not too unique because tadalafil actually has this effect as well-- is that it increases the density of the androgen receptor and the cytoplasm of your cells. So even if your androgen receptor sensitivity doesn't change and even if your testosterone does not change, you will have more testosterone binding to that increased number of receptors.”