Tag: Seasonal effects

Studies show that at latitudes above 35 degrees, people are at a significantly higher risk for vitamin D deficiency during winter months. Latitude is one of the most critical factors influencing the body's ability to produce this essential nutrient from sunlight, creating a clear geographical divide in vitamin D status.

According to the National Institutes of Health, the standard 25-hydroxyvitamin D (25(OH)D) test measures the total vitamin D reserve in your body, which has a half-life of approximately 15 days. This means the specific time of day should you test for vitamin D has a negligible impact on the outcome, prioritizing consistency and convenience over a strict schedule.