Clinical research on vitamin D3, K2, and their critical roles in human health.
Vitamin D3 has earned a lot of attention in immunology research over the past two decades, and not without good reason. Studies keep turning up the same pattern: people with autoimmune conditions tend to have low vitamin D levels, and the biology of how D3 interacts with immune cells gives researchers a plausible explanation for … Read more
Cardiovascular disease remains the leading cause of death globally, and the search for modifiable risk factors has increasingly pointed toward vitamin D status. Observational research has consistently linked low vitamin D levels with higher rates of heart disease, hypertension, and cardiovascular mortality. The mechanistic research explaining why is substantial. But the translation from association to … Read more
Vitamin D3’s role in immune function is one of the more thoroughly researched areas of nutritional immunology. The evidence spans from basic cell biology to large clinical trials on infection outcomes, and the findings are more nuanced than the popular framing of vitamin D as a simple immune booster. Here’s what the research actually shows … Read more
The Biological Connection Between Vitamin D and Mood Vitamin D is not just a bone vitamin. The vitamin D receptor (VDR) is expressed throughout the brain, including in regions directly involved in mood regulation: the limbic system, hippocampus, prefrontal cortex, and hypothalamus. This widespread neural distribution was a clue, years before clinical trials confirmed it, … Read more
What Vitamin D3 Actually Does in Your Body Most people think of vitamin D as the “bone vitamin” because that’s what they were taught in school. That framing dramatically undersells what D3 is doing. Vitamin D3 (cholecalciferol) is actually a precursor hormone that influences over 200 genes and affects nearly every system in your body. … Read more
The Bone Health Conversation Nobody Is Having Honestly For decades, the standard advice on vitamin D for bones was to get your 600-800 IU per day, eat your calcium, and call it done. But a growing body of research is challenging that conservative guidance, and the numbers are telling a different story about how much … Read more
Most people taking vitamin D supplements are taking it without vitamin K2. This is a meaningful gap in their regimen, not because K2 makes D3 work better for its core functions, but because D3 without K2 has a specific unintended consequence that K2 directly prevents: inappropriate calcium deposition in soft tissue and arteries. Disclosure: This … Read more
Vitamin D supplements are not all the same, even when the label says “vitamin D.” The two forms, D3 and D2, differ in origin, bioavailability, and how effectively they raise your blood levels. The difference matters, and it is consistently underappreciated by people choosing supplements. What Are D3 and D2? Vitamin D3 (cholecalciferol) is the … Read more