D-5,000 by Thorne

If your Vitamin D, 25-Hydroxy is low or stuck in the lower-normal range, vitamin D3 5000 IU is a practical daily dose to move it up within 4 to 12 weeks. It fits darker‑skinned adults, indoor workers, northern latitudes, consistent sunscreen users, and those with higher body weight who often need more to achieve the same blood level. It’s also useful if absorption is limited by celiac disease, bariatric surgery, or fat‑blocking drugs. For steady maintenance once your level is where you want it, many people can step down to a lower dose.

Cholecalciferol (vitamin D3) is the form your skin makes from sunlight and is better at raising blood levels than D2 (ergocalciferol). Your liver and kidneys convert D3 into the active hormone that increases calcium absorption from the gut and regulates bone turnover. Adequate D3 keeps parathyroid hormone (the signal that pulls calcium out of bone) in check. Interest in D for infection soared during COVID, but large randomized trials show little to no prevention effect, so take it to correct a low level, not as an immune panacea.

Take one capsule daily with a meal that contains some fat to improve absorption. Morning or evening both work; consistency matters more than timing. Recheck Vitamin D, 25-Hydroxy after 8 to 12 weeks to see if this dose is still needed. If you already take calcium, keep total calcium intake steady while adjusting D3, and avoid stacking multiple D products unknowingly. Thorne D-5,000 provides a single-ingredient, NSF Certified for Sport option.

Skip high‑dose D3 without medical guidance if you’ve had high calcium, recurrent calcium‑based kidney stones, sarcoidosis or other granulomatous disease (conditions that can overproduce active D), or certain lymphomas. Thiazide diuretics (water pills that raise calcium), high‑dose calcium, and long courses of vitamin A increase the risk of high calcium. Orlistat and cholestyramine reduce absorption; anticonvulsants and chronic steroids increase D breakdown, often requiring lab‑guided dosing.