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 Acetyl L Carnitine Dosage for Erectile Dysfunction: What Actually Works Serum l carnitine and vitamin D levels may be low among oral sildenafil citrate non responders International Journal of Impotence Research (C3) Propionyl L carnitine (N methyl d3)