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.
slide 2 of 5. A learning plateau is a term that is often used in educational psychology. This is a kind of phenomenon that refers to a situation when the learner in the course of learning, despite all the efforts of learning and practice, seems to make no significant progress.