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Vitamin D3 is vital for everyone. In clincal studies, it has been shown to reduce the incidence of cancer by as much as 75% (Nurses study) During the spring & summer, I usally take two 5,000 capsules, 1 morning & 1 evening; during the fall/winter, I up it to 20,000 IU and prefer to take a stronger dose capsule. This fits the bill. 1 morning, 1 evening to help maintain levels. I also don't get the flu since Vit D3 really boosts the immune system; and, the flu is the only disease that has a season (winter) when D3 levels are low because of lack of sun light. See the correlation?