Glycine Propionyl L Carnitine and Erectile Dysfunction Glycine Propionyl L Carnitine and Erectile Dysfunction: What the Evidence Shows Acetyl L Carnitine Integrative Therapeutics 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 Swanson Vitamins Propionyl L Carnitine HCl & Glycine Support Propionyl L Carnitine for Erectile Dysfunction