How Much Vitamin D Should You Take? 4.83 (96.67%) 30 votes The safe dose of vitamin D supplementation to get most of the population to the optimal level is 2,000 IU a day, but the elderly and overweight may need more.
roadblock. 1  n any condition that makes it difficult to make progress or to achieve an objective. 2  n a barrier set up by police to stop traffic on a street or road in order to catch a fugitive or inspect traffic etc.
Obstacle to traffic caused by the Ferguson landslide in the state of California (USA). An obstacle (also called a barrier, impediment or stumbling block) is an object, thing, action or situation that causes an obstruction.There are, therefore, different types of obstacles, which can be physical, economic, biopsychosocial, cultural, political, technological or even military.bstacle to traffic caused by the Ferguson landslide in the state of California (USA). An obstacle (also called a barrier, impediment or stumbling block) is an object, thing, action or situation that causes an obstruction.