There have recently been a lot of studies coming out about this. He did not provide me a link, but a quick google search comes up with multiple studies that say the 400-600 IU is just simply too low to provide any benefits. Which makes sense to me seeing that most supplements of vitamin D3 are upwards of 1000 - 5000 IU. There are a few current studies that say they will be done within 3 years (they started at the beginning of the year) having people take 400 IU, 4,000 IU, and 10,000 IU. They believe 400 is way too low, 10,000 is the high, and 4,000 is about the average range for adults.
From a resent study I read, it states that in Canada they take 800 - 2,000 IU, so even the 600 is low to them.
Here are just a few of the studies I've found:healthresearchreport.me/2014/03/22/higher-
If you scroll down to "How much vitamin D do I need to take" it has a chart: www.vitamindcouncil.org/about-vitamin-d/ho
" If you have not taken a vitamin D blood test and you’re looking for general guidelines, Holick suggests that children take 1,000 to 2,000 IU and adults take 2,000 to 3,000 IU daily. “The bottom line for me is that there is probably no evidence that these amounts pose any risk,” he says. Cannell’s recommendation: Don’t drive yourself crazy with all the qualifications. “Just take 5,000 IU a day, unless you’re going outside to work or to the garden or beach.” The higher amount might be particularly helpful for people with a chronic illness, such as fibromyalgia, arthritis or lupus, adds Hunninghake. “These high doses of vitamin D, while generally safe, should be monitored with follow-up blood level [tests],” he says." experiencelife.com/article/the-vitamin-d-d
That is all I had time to post now, seeing as I am at work, but as you can see, there are multiple studies happening. Some think that the low dose of vitamin D is a plot by the cancer industry to make sure they still have patients with bone cancer. I'm not saying I believe this, but stranger things have happened.
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