There is no single multivitamin that instantly boosts brain power, but certain nutrients are key for cognitive health. Look for a supplement containing B-complex vitamins (especially B12 and folate) for nerve function, Vitamin D, and Omega-3 fatty acids (like fish oil) for memory and focus. Rather than a generic multivitamin, a targeted supplement or a nutrient-rich diet (rich in leafy greens, berries, and fish) often works best. Please consult your doctor before starting any new supplement to ensure it is safe and tailored to your specific needs.