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.
When the road is blocked ahead of you, that blockage is an obstacle that keeps you from getting where you want to go. The Latin word that is the source of the word obstacle combines parts that mean to stand in the way of, so an obstacle is something that stands against what you want to do. In a dramatic piece, the obstacle is the person or thing that keeps a character from achieving his or her goal.