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I doubt that vitamin D is a cure-all for any one ailment, including bc.
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But a
Possible 75% cancer mortality reduction with Vitamin D is not to be ignored.
this chart plots the incidence of metastases over several years in relation to 25(OH)D status.
Vitamin D deficiency may be associated with poor outcomes in breast cancer.
The sensible thing to do therefore is to take sufficient vitamin d to ensure you are never in the lowest quartile where the incidence of metastases is greater.
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, especially considering possible toxicities that may be associated with long-term mega-dosing.
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There is absolutely no danger in taking sufficient vitamin d to restore your 25(OH)D to the NATURAL level our recent ancestors would have naturally achieved prior to the introduction of inflammatory foods to our diet.
The lecture from
Vieth in this series on Vitamin D about the absence of risk makes the scientific evidence easier to understand but bear in mind that was 2006 and much work has been done since then and he is even more confident of his stance now see
Vitamin D and cancer mini-symposium: the risk of additional vitamin D.
For more information see
The Vitamin D Council Breast Cancer
But remember our skin naturally will make up to 20,000iu/daily given full body prone NON BURNING sun exposure. It does that for a purpose. So that surplus vitamin d3 can be stored in muscle and fat cells for use in winter or when the body is challenged and needs to draw on it's reserves of anti inflammatory agents.
The only people who have adequate
stored D3 available for emergencies are those with 25(OH)D levels above 50ng/mL You can achieve a store with regular full body prone midday sun exposure or by taking @5000iu/daily/d3 or as Vieth has made clear by doing both.
But getting a 25(OH)D test is the only way you will discover what your current vitamin d3 status is and only by regularly monitoring that level will be be able to find out what intake of supplemental Vitamin D3 is sufficient to keep your body around the level associated with best prognosis.
In order to have some cost perspective the testing is around $40 £24 for UK readers and 5000iu/daily supplements work out around 7cents daily or 5p in UK money.