L Carnitine Penis Growth: What the Evidence Actually Shows 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 & ED : Benefits, Effects & Uses Allo Health Blog Serum l carnitine and vitamin D levels may be low among oral sildenafil citrate non responders International Journal of Impotence Research Propionyl L carnitine L Carnitine Derivative MedChemExpress 8 Supplements for ED Rex MD