The antioxidant properties of thiamine can help slow the progression of Alzheimer's disease and dementia. Experts believe free radical damage is part of what causes these memory conditions and a healthy amount of antioxidants could improve the prognosis. Some successful studies supplemented the diets of people with Alzheimer's with 100 mg of thiamine. Many of the subjects reported symptom relief after taking vitamin B1 over the course of several weeks.

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