Herbal Viagra and Nitric Oxide: How Hard is the Evidence? Cureus Swanson Propionyl L Carnitine 515mg + Glycine 60 Veggie Caps Walmart.com L Carnitine for Erectile Dysfunction: What the Evidence Shows and Practical Considerations Do nutraceuticals work in erectile dysfunction? Although nutraceutical based treatments are often offered for erectile dysfunction (ED), their efficacy remains doubtful. In a recent meta analysis, the efficacy of available nutraceutical