The wide-ranging health benefits of vitamin D3 and K2 — bones, immunity, mood, and more.
Vitamin D deficiency is one of the most widespread nutrient deficiencies in the world, affecting an estimated 1 billion people globally. It is also one of the most underdiagnosed, partly because the symptoms are nonspecific and easy to attribute to other causes. Fatigue, mood changes, and muscle weakness do not immediately make most people think … 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 connection between vitamin D and testosterone is one of the more intriguing areas of men’s health research. The evidence is real enough to take seriously, but it comes with important caveats that most articles in this space omit. Here is the honest breakdown. The Biological Basis: VDRs in Leydig Cells Testosterone is primarily produced … Read more
Vitamin D deficiency affects an estimated 42% of American adults. One billion people worldwide have insufficient vitamin D levels. Most of them do not know it. The symptoms are diffuse, non-specific, and easy to attribute to other causes. Here is how to recognize the signs and who is most at risk. Why Deficiency Is So … Read more