A Novel Multi Supplement Based on Guarana, Selenium, and L Carnitine Reduces Organ Specific Oxidative Stress But Not Oxidative Stress Induced Anxiety Revista Brasileira de Farmacognosia Springer Nature Link Reckful L Carnitine Guarana 4000 : 1685 . Guarana Active 100 capsules as a natural source of caffeine IronMaxx Nutrition N1 Morning Burner Energy Boost with L Carnitine Green Tea Extract Guarana 60 Capsules Vegan Supplement, Health & Nutrition, Health Supplements, Vitamins & Supplements on Carousell Guarana + L Carnitine liquid concentrate 500 , Sportlane