I highly recommend everyone also supplement vitamin K2 (a longer lasting form of vitamin K).

Vitamin D, either from supplementation or from sun exposure, helps your body absorb calcium. However, it can also leach calcium from your bones and deposit it elsewhere in your body, causing weak bones and calcified blood vessels. Vitamin K, among other things, tells your body where to put the calcium, and strengthens bones and uncalcifies blood vessels in the process. Due to modern factory farming and the modern diet, most people don't get enough vitamin K. Most factory farm raised animals don't graze naturally, and their meats, milk, eggs, and fats have much lower vitamin K levels. We also very rarely eat animal organs, like liver, which are much higher in vitamin K. We also don't eat enough vegetables anymore, many of which also provide high levels of vitamin K.