l-carnitine doping Mo Farah explains why he changed story on taking | The Independent EFX Sports L-Carnitine Liquid 1500mg,

Vegetarian and vegan individuals have lower average L-carnitine levels but typically do not develop deficiency because the body synthesizes sufficient amounts endogenously

To understand thebest time to take L-Carnitine, it helps to know how it behaves once consumed

Toll-like receptor family activates nuclear factor-kappa b (NF-B), a pro-inflammatory transcription factor that promotes production not only of cytokines but ROS as well (Morgan and Liu 2011)

Adicionalmente, la L-Carnitina tiene efectos positivos en la salud cardiovascular, mejora la funcin cerebral y reduce el riesgo de enfermedades metablicas

In other words, you might have injured your penis and its having trouble healing