Acetyl L Carnitine Dosage for Erectile Dysfunction Acetyl L Carnitine is a modified form of carnitine that has the dual benefit of supporting mental fatigue, improving mood levels and alertness as it crosses the blood brain barrier with ease while supporting Supplements and chronic pain: What does the research say? Some studies suggest possible benefits for: Acetyl L Carnitine (energy for cells; studied in diabetic nerve pain) Alpha Lipoic Acid (antioxidant; may ease nerve pain, Acetyl L Carnitine Force Factor