Vitamin D supplementation (800 IU daily for one year) improved memory, attention, and IQ in individuals with mild cognitive impairment.

“Randomized controlled trials (800 IU/day vitamin D₃ for 12 months) show measurable cognitive improvements and reductions in Alzheimer's biomarkers in adults already experiencing cognitive impairment.”

“It’s no surprise, then, that higher vitamin D levels are associated with better cognition, larger hippocampal volume, and lower Alzheimer’s risk.”

“Furthermore, supplementing with 800 IU/day of vitamin D improves memory and cognitive function in people with mild cognitive impairment and more serious forms of dementia.”

“So people that took again 800 IUs a day for over a year and these people were already diagnosed with Alzheimer's disease. They also had improved scores on memory and attention tests similar to that first trial I just mentioned. But additionally, there was also a reduction in blood biomarkers of amalloid beta pathology such as amaloid beta 42 which is associated with Alzheimer's disease progression.”

“So both in both those scenarios and people with mild cognitive impairment if they took around 800 IUs of vitamin D daily for a year they had significant improvements in multiple areas of cognition, memory, attention, overall IQ.”

“people that had Alzheimer's disease and they were actually only given a pretty low dose of vitamin D. They were given about 800 IUs of vitamin D per day for one year. And that improved their cognitive performance. So memory, cognition and it also reduced biomarkers of Alzheimer's disease including the amaloid beta.”

“those individuals were given 800 IUs a day for about a year and that also of and these are both placeboc controlled studies. Um, and the vitamin D also improved cognitive function in those individuals with mild cognitive decline.”