Propionyl L Carnitine for Erectile Dysfunction Swanson Vitamins Propionyl L Carnitine HCl & Glycine Support 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 Glycine Propionyl L Carnitine and Erectile Dysfunction