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
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
The vitamin D dosage question has two answers: the official government answer and the research-supported practical answer. They differ substantially, and understanding why matters for getting real benefit from supplementation. The Official RDA and Why It Falls Short The current Recommended Dietary Allowance (RDA) for vitamin D is 600 IU per day for adults under … 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