L arginine and Erectile Dysfunction: Uses, Side Effects, Benefits Allo Health Blog L Carnitine Fumarate Olympian Labs Serum l carnitine and vitamin D levels may be low among oral sildenafil citrate non responders International Journal of Impotence Research 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