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 Propionyl L Carnitine for Erectile Dysfunction Propionyl L Carnitine with Viagra: What the Evidence Shows for Men Exploring This Combination Glycine propionyl L carnitine and erectile dysfunction Combination therapy with topical alprostadil and phosphodiesterase 5 inhibitors after failure of oral therapy in patients with erectile dysfunction: a prospective, two arm, open label, non randomized study International Journal of Impotence Research