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 Amazon.com: Swanson Propionyl L Carnitine with Glycine Natural Supplement Promoting Heart Health & Energy Support May Support Muscle Strength & Endurance (60 Veggie Capsules) : Health & Household 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