Does L carnitine cause erectile dysfunction? Acetyl L Carnitine Dosage Erectile Dysfunction: What the Evidence Shows and How to Approach It Peyronie's disease: a critical appraisal of current diagnosis and treatment International Journal of Impotence Research Understanding Loss of Sensitivity in Penis: Causes and Evidence Based Approaches Acetyl l carnitine plus propionyl l carnitine improve efficacy of sildenafil in treatment of erectile dysfunction after bilateral nerve sparing radical retropubic prostatectomy ScienceDirect