For most people, acetyl-L-carnitine and L-carnitine seem to be the most effective forms for general use
Aioub AAA, Abdelnour SA, Hashem AS, Maher M, Abdel-Wahab SIZ, Alkeridis LA, et al
The primary efficacy outcome was change in Total Score from baseline to endpoint in investigator ratings on the ADHD Rating Scale (ADHD-RS), an 18-item questionnaire with a score range of 0-54 points that measures the core symptoms of ADHD which includes both hyperactive/impulsive and inattentive subscales

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