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I take about 2000 IU per day, as recommended by Dr. Norton from the Memorial Sloan-Kettering.
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For a long time it was thought that 2000iu/daily was the safe upper limit, so doctors were reluctant to suggest amounts higher than the "official" safe upper limit, even though common sense should have informed them that as
giving infants in their first year of life 2000iu/daily only resulted in an 80% reduction in Type 1 diabetes over the next 30yrs that if newborn babies can safely take 2000iu/d it is probable that adult sized bodies may safely consume more.
We now know that Vitamin D is a lot safer than previously thought.
In fact here is a report of
a 56-year-old woman who received supratherapeutic doses of ergocalciferol (150,000 IU orally daily) for 28 years without toxicity Given ergocalciferol is the form of vitamin D usually prescribed by health professionals and is (as that example shows) not utilized at all by many individuals, one cannot always rely on the accuracy of information about supplements from health professionals.
Dr Davis of the Heartscanblog discusses The case against vitamin D2 and questions the ethics prescribing the more expensive but least effective form of the vitamin. Dr Davis finds at Wisconsin his heart disease patients generally require 5000iu/daily females and 6000iu/daily males to attain what he considers the safest level for heart disease patients 60~70ng/mL.
Each individual responds differently to oral vitamin D3 supplementation in the same way each person will be respond differently to sun exposure. Some people will find 10~20 minutes full body midday sun exposure is sufficient while others will require 20~30 minutes daily.
The only way you can be sure your body has attained and is maintaining a safe 25(OH)D status is by having a regular 25(OH)D blood test.
However, in the mean time, given the consequences of low vitamin d status are far worse than a slightly higher level than average, and taking into consideration the scientific evidence showing the average adult can safely consume up to 10,000iu/daily while also getting regular sun exposure, the safest option is to use a 5000iu/daily oil-based gel D3 capsule or one recommended from The Vitamin D Council website. It will then be a simple matter to reduce intake by 1000iu/daily for each 10ng/mL you have overshot the 70ng/mL level for people with a cancer diagnosis. or be in a better position to understand how your body requires more perhaps more like 2000iu to raise status by 10ng/mL to reach 55ng/mL ( the minimum safe level for good BC prognosis)
As a basic guide to the latest research in Vitamin D3 this video explains what vitamin D deficiency is.
What's a Vitamin d Deficiency?
there are more similar evidence based videos at
Grassrootshealth.net