Pin to Board Add to Existing Board You are not currently logged in. Log in or create an account to save and view pinboards. Create New Board 9 Silent Signs of a Vitamin K Deficiency Up to 31 percent of adults may be insufficient in vitamin K, and that could affect your bones, joints, and heart. Source: 9 Silent Signs of a Vitamin K Deficiency Write for NutriScape! Cancel replyYou must be logged in to post a comment.