l-carnitine concentrate reviews Parker Naturals Concentrated Liquid, 5000mg All Natural Citrus Flavored L-Carnitine Supplement, Liquid L-Carnitine with Vitamin V5, 16.23 Fl. Oz : Health & Household Page 1 - Reviews -
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Studies[2] found that about 3 out of 4 men saw improvement, especially those with blood flow-related ED (vasculogenic ED)

Ammonia is a product of protein degradation and is also one of the markers for exercise-induced fatigue

Lopes da Silva S, Vellas B, Elemans S, Luchsinger J, Kamphuis P, Yaffe K, et al

Supplementation with B-vitamins may help improve nerve function and reduce the risk of diabetic neuropathy