Vitamin D3 (Cholecalciferol) is so potent and fat soluble, the capsules are tiny, filled with olive oil, and easy to swallow. The label instructs to take one 5,000 IU capsule every three days, for an average daily dosage of 5000/3 = 1667 IU/day. Since the 120 capsule bottle costs $8.80, taking one capsule every third day will last one full year, which is impossible to beat for the price. “Day skipping” works well with Vitamin D3, since after being quickly metabolized by your liver into “25-hydroxy vitamin D”, that fat soluble metabolite has a half-life of at least three weeks in the body. So whatever regimen you choose will quickly "average out" to a nice even level in your blood. If you want to change selection, open document below and click on "Move attachment" GRC | Vitamin D Research my own use, and it's what I had been recommending to others. I have since switched to the Vitamin D from “Healthy Origins” (see below) because it is even less expensive than Now Foods and they are an equally good and trusted supplier.Because <span>Vitamin D3 (Cholecalciferol) is so potent and fat soluble, the capsules are tiny, filled with olive oil, and easy to swallow. The label instructs to take one 5,000 IU capsule every three days, for an average daily dosage of 5000/3 = 1667 IU/day. Since the 120 capsule bottle costs$8.80, taking one capsule every third day will last one full year, which is impossible to beat for the price.“Day skipping” works well with Vitamin D3, since after being quickly metabolized by your liver into “25-hydroxy vitamin D”, that fat soluble metabolite has a half-life of at least three weeks in the body. So whatever regimen you choose will quickly "average out" to a nice even level in your blood.Although you should never go “off label” to obtain a higher dosage without the advice of a doctor and/or keeping an eye on your important blood levels, especially calcium, this high-pote