Vit D was thought to be a non-issue when it was provided as a preventive of Rickets. Rickets was a disabling disease of bone deformity of children. Over the past decade, we've discovered that Rickets was just the tip of the iceberg. Now we're discovering multiple functions, especially anti-inflammatory in nature. Significant evidence supports the prevention of cardiovascular disease, multiple cancers, and even mental health issues. The Wikipedia site on Vit D appears outdated. It doesn't mention the recent data about these issues. Vit D toxicity is a debatable condition. Toxicity has been reported to kidneys at doses over 50 times the recommended amount. Vit D increases calcium absorption by the gut. But what happens next? That's supposed to be where Vit K2 enters the picture. Vit K2 is involved in getting calcium to the bone. There is evidence that k2 decreases the deposition of calcium in the artery walls. The scientific evidence in this area is growing.