Vyvanse (Lisdexamfetamine) for ADHD: Efficacy, Safety, and What Patients Should Know Philadelphia Integrative Psychiatry Did you know? Vitamin C can affect how well ADHD medication works. Supplements or drinks high in vitamin C (like orange juice) can interfere with the absorption of medications such as: L Carnitine Fumarate, 180 Veggie Caps (500 mg per Veggie Cap) Frontline Formulations L Carnitine Hawaiian Punch
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