Taking It on an Empty Stomach
Vitamin D is fat-soluble. That single fact changes everything about when and how the body absorbs it. Unlike water-soluble vitamins that dissolve in the gut regardless of what else is there, vitamin D needs dietary fat present to cross the intestinal wall and enter circulation. A capsule swallowed with plain water before breakfast passes through largely unused. Studies examining vitamin D absorption have consistently found that taking it with a meal containing fat, even a modest amount, such as a handful of peanuts or a small serving of curd, raises serum levels meaningfully compared with fasted intake. The practical fix is simple: take the supplement with your largest meal of the day, which for most Indian households is lunch or dinner and almost always contains enough fat to do the job.
