Vitamin D2 Supplements May Reduce Levels of More Effective Vitamin D3, Study Finds
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A new analysis suggests that commonly taken vitamin D2 supplements could inadvertently lower the body’s concentration of vitamin D3, the form of the vitamin most efficiently used to boost overall levels and support health.
Many individuals rely on vitamin D supplements, especially during the winter months, to maintain bone and immune health and meet the UK government’s recommended daily intake of 10 micrograms (µg). However, emerging research from the University of Surrey, John Innes Center, and Quadram Institute Bioscience indicates that not all vitamin D supplements are created equal.
The D2 vs. D3 debate
Two primary forms of vitamin D supplements are available: vitamin D2 and vitamin D3. While both aim to increase vitamin D levels, researchers have discovered a potentially concerning effect of vitamin D2 supplementation – a reduction in the body’s levels of vitamin D3. This is significant because vitamin D3 is the form our bodies naturally produce from sunlight exposure and utilize most effectively.
The study, published in Nutrition Reviews, analyzed data from multiple randomized controlled trials. The findings revealed that individuals taking vitamin D2 supplements experienced a decrease in vitamin D3 concentrations compared to those who did not take vitamin D2. in a considerable number of the trials, vitamin D3 levels actually fell below those observed in the control groups.
“Vitamin D supplements are crucial, especially between October and March, when our bodies cannot make vitamin D from sunlight in the UK,” explained a lead researcher from the University of Surrey’s Nutrition, Exercise, Chronobiology & Sleep Discipline. “However, we discovered that vitamin D2 supplements can actually decrease levels of vitamin D3 in the body, which is a previously unknown effect of taking these supplements. This study suggests that,subject to personal considerations,vitamin D3 supplements might potentially be more beneficial for most individuals over vitamin D2.”
Implications for Immune Function
This research builds upon previous findings published in Frontiers in Immunology, which indicated that vitamin D2 and D3 play distinct roles in supporting immune function. The earlier study, led by a researcher at the University of Surrey, suggested that vitamin D3 possesses a unique ability to modulate the immune system, potentially strengthening the body’s defenses against viral and bacterial diseases.
“We have shown that vitamin D3,but not vitamin D2,appears to stimulate the type I interferon signalling system in the body – a key part of the immune system that provides a first line of defense against bacteria and viruses,” stated a senior researcher involved in the Frontiers in Immunology study. “Thus, a healthy vitamin D3 status may help prevent viruses and bacteria from gaining a foothold in the body.”
The Need for Plant-Based Vitamin D3
The findings also underscore the importance of accessibility to plant-based vitamin D3. A Group Leader at the John Innes Centre emphasized that ensuring this form of the vitamin is readily available in the UK is crucial.
Addressing the broader public health implications, a Chief Scientific Officer at the Quadram Institute noted that vitamin D deficiency is a significant concern, particularly during the winter months when a large portion of the UK population experiences insufficient levels. This collaborative research effort, they added, aligns with the Institute’s mission to improve public health through food innovation and enhanced nutrient density.
further investigation into the specific functionalities of vitamin D2 and D3 is now a priority, with researchers aiming to determine weather vitamin D3 should be considered the first-line choice for vitamin D supplementation, tailored to individual needs.The ongoing research highlights the complexities of vitamin D metabolism and the importance of informed choices when selecting a supplement.
