Are There Supplements Faster Than Viagra? A Practical Look at Natural Options for Men 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 Acetyl L Carnitine Integrative Therapeutics Amazon.com: Biolor High Absorption Propionyl L Carnitine (PLCAR) No Artificial Fillers Effective Propionyl L Carnitine HCL Supplement to Support Blood Circulation 120 Capsules : Health & Household Carnitine deficiency erectile dysfunction