CAT and Alzheimer disease: Other drugs with antioxidant action in relation to AD include resveratrol (a compound from grapes), vitamin B12, carotenoids, ascorbic acid (vitamin C), catalase, glutathione peroxidase, caffeine, selenium, melatonin, omega 3, silibinin flavonoids, palmatine alkaloids, berberine and ubiquinone terpenoids.26