Vitamin D3 125mcg (5000 IU) by Pure Encapsulations

This dose fits adults whose Vitamin D, 25-Hydroxy is low or in the lower part of the normal range and who want a time-limited repletion plan. It’s practical if you get little sun, have darker skin, live at northern latitudes, or carry more body weight, where smaller doses often underperform. It’s also useful after winter, for night-shift workers, or if absorption is reduced by restrictive diets, bariatric surgery, celiac disease, or inflammatory bowel disease. For long-term maintenance, many people step down to 1,000–2,000 IU once levels are stable.

Cholecalciferol (vitamin D3) is the form your skin makes from sunlight and it raises blood levels more reliably than D2 (ergocalciferol). Your liver and kidneys convert it to the active hormone that increases calcium absorption from the gut and helps regulate bone turnover. Adequate D3 keeps parathyroid hormone (the signal that pulls calcium from bone) in check, which is one reason fracture risk falls when vitamin D is paired with calcium in deficient adults. The hype around vitamin D preventing infections is mixed; large randomized trials show little to no benefit for most people.

Take one capsule daily with a meal that includes fat for better absorption. Recheck Vitamin D, 25-Hydroxy after 8–12 weeks to confirm the dose is doing what you expect, then taper to a maintenance dose once your level is where you want it. If you miss days frequently, a clinician may suggest less frequent higher dosing, but daily is simpler for most. Magnesium adequacy helps vitamin D work; calcium is individualized.

Skip or use only with medical guidance if you have a history of high blood calcium, recurrent kidney stones, granulomatous diseases like sarcoidosis, or primary hyperparathyroidism. Use caution if you take thiazide diuretics (blood pressure drugs that raise calcium), as the combination can push calcium too high. Orlistat (a fat-blocker) and bile acid resins reduce absorption, so timing and monitoring matter. Pregnancy and chronic kidney disease need clinician-set targets and dosing.