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.
Idioms and Phrases with stumbling block. A hindrance or obstacle, as in His lack of a degree is a real stumbling block to his advancement. This term originally meant âa tree stump over which one trips.â Its figurative use dates from the early 1500s.