"Vitamin D and Diseases of Aging" by Richard Jacobson
Quite a useful summary of the Vitamin D research.
Still watching as I post so not sure if I agree with it all as yet but so far he's spot on.
First niggle is he says D2 is only available on prescription. That's misleading because some over the counter Vitamin D supplements have D2 AND some multivits use D2. also D2 may be added to foods so vitamin D milk in the US may D2 not D3.
I'm glad he stresses the importance of magnesium while using D3.
Should perhaps have suggested that supplementing with calcium when increasing vitamin D status is probably a waste of money (as there should be plenty in diet/water) and could be dangerous.

Interesting the section on Autophagy and it's link with ageing.
Autophagy as a basis for the health-promoting effects of vitamin D

Vitamin D and cancer campaign launched today

SAN LUIS OBISPO, CA, September 6, 2011 � The Vitamin D Council, a nonprofit educational corporation based in California, launches their �Vitamin D and Cancer� campaign today, presenting 20 detailed summaries of the evidence on the role of vitamin D in preventing cancer. Epidemiologist Dr. William Grant prepared the evidence-based summaries. He is the founder of the nonprofit organization, Sunlight, Nutrition and Health Research Center (SUNARC) and serves as the Science Director for the Vitamin D Council.

Some researchers believe the link between vitamin D sufficiency and a decreased risk in cancer is promising. A randomized controlled trial found a 77% reduction in all-cancer incidence when the study group supplemented with 1100 IU/day of vitamin D plus 1450 mg/day calcium. Says Dr. Grant, �Based on various studies of UVB, vitamin D and cancer to date, it appears that global cancer burden can be reduced by 15-25% if everyone had vitamin D blood levels above 40 ng/ml.�

The summaries can be found under the �Health conditions� tab on the Vitamin D Council website, or more specifically at https://www.vitamindcouncil.org/healt...itions/cancer/. The Vitamin D Council hopes the campaign will spread more awareness about the importance of vitamin D sufficiency and the dangers of vitamin D deficiency.

Top ten facts about vitamin D and cancer (presented in the summaries):
Many studies have found solar ultraviolet-B (UVB) and vitamin D associated with reduced risk of breast, colon, and rectal cancer.
A randomized controlled trial with 1100 IU/day vitamin D3 plus 1450 mg/day calcium found a 77% reduction in all-cancer incidence.
Geographical studies have found reduced risk in mortality rates for 20 types of cancer in regions of higher solar UVB doses.
Observational studies have found that the risk of breast, colon, and rectal cancer fall as vitamin D blood levels rise at least up to 40 ng/mL (100 nmol/L).
Mechanisms have been proposed to explain how vitamin D acts to reduce the risk of cancer from starting, growing, and spreading.
Those who develop nonmelanoma skin cancer may have produced enough vitamin D to reduce their risk of internal cancers.
Those with higher vitamin D blood levels at time of cancer diagnosis had nearly twice the survival rate of those with the lowest levels.
African-Americans have an increased risk of cancer in part due to lower vitamin D blood levels because of darker skin.
Higher UVB exposure early in life has been found associated with reduced risk of breast and prostate cancer.
Those diagnosed with breast, colon and prostate cancer in summer in Norway had higher survival rates than those diagnosed in winter.
Copyright � 2011 The Vitamin D Council, All rights reserved.

The Vitamin D Council
1241 Johnson Ave. #134
San Luis Obispo, CA 93401

Most of what we now know about vitamin D we have learned in the last 10 years, and even with all that good information I would be willing to bet at least half of the people on this site are deficient in vitamin D.

Not only that, but Canada is above the 49th parallel, which means at least 80% of all Canadians are deficient in D, and perhaps as high as 90%.

Maybe that has something to do with being dummed-down with fluoride..

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Let Food Be Your Medicine And Medicine Be Your Food.(Hippocrates)