High-dose vitamin D supplementation (4,000 IU) improved visual memory but low-dose vitamin D (400 IU) did not.
Randomized controlled trial finds that high dose vitamin D supplementation (4,000 IU/day) for 18 weeks improves visual memory in healthy adults but low-dose vitamin D (400 IU/day) does not.
Serum 25 hydroxy vitamin D levels increased significantly more in the high dose group (from 27 ng/ml to 52 ng/ml) than the low dose group (24 ng/ml to 34 ng/ml). What is interesting is that even though 34 ng/ml is considered sufficient, it still was not enough to improve visual memory.
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It has been suggested that visual memory tasks place greater demands on cognitive processing, organization, planning, and overall executive functioning than do verbal memory tasks, and require more fluid cognitive processes.