All cancers. Unless you work in the fields or on a lifeguard tower, take 2,500 iu a day year round, maybe 5000 iu in winter or when exposed to more sick people. More if you have health problems already.
“Unless you work in the fields or on a lifeguard tower, take 2,500 iu a day year round, maybe 5000 iu in winter or when exposed to more sick people.”
Studies I read several years found even some lifeguards to have much lower levels of vitamin D than expected.
Unless you work in the fields or on a lifeguard tower, take 2,500 iu a day year round
That will cause excess in some people. For people without access to the sun, 10 micrograms per day is often enough. If it isn’t, one could eat sardines, eggs, or other foods with vitamin D.
Reading about the combined beneficial effects of zinc and VitD, I decided to have my D-level checked in my regular bloodwork for the first time. I was concerned from reading that maybe my D level might be high.
It was 31, which is at the bottom of the recommended range of 30 to 100 (optimum range 40-80) ng/ml. I was surprised and started taking 5000IU 2X daily with my morning and evening pills.
In 3 months it checked at 51, and three months later at 48. This is right in the "best" range to be at in what I read so I am fine with being near 50 two different times.
I am large, and my Dr said that unlike water soluble materials, getting the D level up in "large" people would be expected to require a higher dose.
"Suffice it to say that humans can make it (vitamin D), IF we get adequate sunshine, or eat very large amounts of healthy ocean fish. Here in the temperate zone, we used to get a lot of sunshine in the summer, but very little in the winter. Years ago, the typical farmer, working all day in the summer sun might generate 40,000-60,000 IU’s of vitamin D each day, much of which his body stored in his fat cells. These higher doses of stored D3 were later available to him in the winter months."
These were pre-sun-avoidance and pre-sunscreen days back then.
Note that when they do high supplementation for treating certain diseases or D deficiency, from 24,000 to 60,000IU daily or weekly may be given.
"Taking 60,000 international units (IU) a day of vitamin D for several months has been shown to cause toxicity. This level is many times higher than the U.S. Recommended Dietary Allowance (RDA) for most adults of 600 IU of vitamin D a day."
So you have to take A LOT!!! of D supplementation - 100X the RDA for MONTHS - to get to toxicity levels.
Note that K2 is recommended along with D to make sure the D doesn't have a negative effect of calcium levels. K2 supports good calcium levels.