Cialis L Arginine L Carnitine Erectile Dysfunction: What the Evidence Shows and Practical Considerations Acetyl l carnitine plus propionyl l carnitine improve efficacy of sildenafil in treatment of erectile dysfunction after bilateral nerve sparing radical retropubic prostatectomy ScienceDirect Are there any interactions between taking L arginine and L citrulline with Tadalafil (Cialis)? Can tadalafil improve body composition? Tadalafil is a medical drug used for the treatment of erectile dysfunction (similar to Viagra). These drugs are best known for boosting blood flow. However, there are Can Cialis Extend Your Life? The Surprising Longevity Benefits of Tadalafil!