In other memory related news (see previous post), a 2017 randomised trial in healthy adults showed that high levels of vitamin D improved visual and non-verbal memory, resulting in higher-level cognitive function. This trial was conducted in healthy adults so the mechanism isn’t necessarily about correcting disordered function related to a disease state. However, the impact of higher doses (4000iu daily) was greater in those with lower baseline levels of vitamin D (75 nmol/L). Interestingly most Australian pathology labs indicate that a vitamin D level between 50-100 nmol/L is sufficient. On this basis a proportion of adults that have ‘normal’ levels of vitamin D may benefit from increasing their level to the high-normal range.