Vitamin D is responsible for increasing intestinal absorption of calcium, magnesium, and phosphate. In general, vitamin D functions to activate the innate and dampen the adaptive immune systems.
My Story Back around 2002 I took up golf and have played it an average of 3 days a week for the last 15 years. Prior to that I was accustomed to getting 2 or more episodes of a cold or flu each year. The last 15 years have seen me with no colds or flu whatsoever. What is this strange link between golf and immunity to colds?
My conclusion has been that it must be related to the sunshine I'm getting on such a regular basis throughout the year. This has been backed up by the research I've done on the benefits of vitamin D and much of which I've linked to below.
Read on to find out more of the potential benefits of getting out in the sun more often - or supplementing if that is difficult.
This is the first video on this page and the one I would recommend to watch first.
Here is a professor (Cedric F. Garland), talking about what he has found regarding its protective effect against various cancers
Ivor Cummins on Vitamin D from an engineer's perspective.
"Leveraging the knowledge of the foremost experts in the field, I can now release what I believe is a comprehensive explanation of the Vitamin D story. It's benefits are difficult to disentangle from those of healthy Sun Exposure though - the beneficial effects of D status may be hugely due to the sun exposure that got your D up! I use sun and UV sources to achieve my D levels as a result, not supplementation. Other key elements like K2, A, Mg etc are inextricably linked also, but here we focus mainly on D. Reverse Causality applies also - people who have inflammatory issues and are obese may drive down their D status, but data on this is sparse - but keep it in mind. Also important is that DAILY supplementation rather than big bolus dosing is used - the half-life of D3 is only a couple of days. This Seminar is of interest to Mothers & their Children particularly (e.g. see 15:00:00 to 21:00:00 segment), to avoid probability of serious chronic diseases, in childhood and beyond. The main message is that blood levels of D should be targeted towards healthy evolutionary levels, ideally through access to UVB / healthy sun exposure (NO burning). So to stress again: there is a lot of associational "correlation but possibly not causation" data in this, and there is every possibility that Sun exposure delivers more benefits than D3 supplements (by the production of many other photoproducts in the skin), and also the modern carb-inflamed/diseased population may be causal in driving down 25(OH)D status (e.g. the obese people with low D - is it their fat sequestering away the D, or is their inflammation driving down their status?) Anyway, thanks for watching! Ivor Cummins BE(Chem), CEng MIEI
Christopher Sorli gives a very good lecture showing the data that relates to vitamin d3 benefits and dosages
Michael Holick talks about sunlight and its effects on our physiology
Bruce Hollis PhD discusses results of a Prostate Cancer/Vitamin D Trial: Effectiveness Safety Recommendations
How Does it All Work?
Post by Raymund Edwards Vitamin D functions within two systems in the human body:
The endocrine system - maintains calcium homeostasis and bone health. This system uses the metabolized form of vitamin D called 25(OH)D and by the time it is turned into 1,25(OH)2D, the usable form, it has a half life of three weeks. All the studies on bone health have been successful based on dosage, not frequency, because of this long half life.
The autocrine/paracrine system - vitamin D is delivered to non-skeletal systems such as breast, colon, and prostate tissues and helps affect autoimmune disorders, cancer, cardiovascular disease and infections. In this system, vitamin D goes into a cell and helps regulate cell growth, after this process vitamin D has a half life of 24 hours, meaning frequency of dosing matters when testing for disease reduction and immune control.
How is vitamin D absorbed and used in your body?
Vitamin D3 enters the body through sun exposure, diet or a supplement and goes into the blood stream where it binds to the vitamin D binding protein (VDBP) -- a protein that carries vitamin D compounds into circulation. From there, vitamin D3 functions within two systems in the human body (the two systems mentioned above ).
The first is the endocrine system, which maintains calcium homeostasis and bone health. In this system, vitamin D3 is transported to the liver where it is metabolized into 25(OH)D. The 25(OH)D along with the VDBP complex (binding protein) is then transported into the kidneys via a special active transport system--called the megalin-mediated system. The kidney's enzymes transform the compound into the active hormone 1,25(OH)2D, and the kidney then excretes 1,25(OH)2D back into the blood stream where the intestine helps facilitate calcium absorption--maintaining bone health.
The second of these systems is the autocrine/paracrine system. Through these pathways, vitamin D3 is delivered to the majority of non-skeletal systems such as the breast, colon, skin, brain, ovary and prostate tissues. While vitamin D3 is transported through the blood stream, it breaks its bind from VDBP and enters the body's various cells via simple diffusion. Within the cell, enzymes metabolize the vitamin D3 to 25(OH)D and then to 1,25(OH)2D, which works to regulate cell growth and perform other helpful functions.
Tissues in the autocrine/paracrine system are not equipped with the megalin-mediated transport system, so if vitamin D compounds are bound to the VDBP, they cannot enter these cells. Vitamin D3 binds loosely to the VDBP and can easily break off and enter the cells of the autocrine/paracrine system. Conversely, 25(OH)D binds very tightly to the VDBP and only a small amount is able to break free and enter these tissues. Therefore, vitamin D3 is needed for these non-skeletal systems.
Why is daily vitamin D input needed?
The length of time that a vitamin D compound stays in the blood is based on how tightly it is bound to the VDBP (the vitamin D binding protein). The 25(OH)D used in the endrocrine system has a half life of three weeks because it is bound very tightly to the VDBP, while vitamin D3 used in the autocrine system has a half life of 24 hours. Therefore, a daily input is needed to maintain stable vitamin D3 levels for non-skeletal systems. For bone health, a weekly or even monthly intake would have a positive effect on the body.
For example, if someone takes a large dose of vitamin D3 on a weekly basis, within a couple days all of the vitamin D3 is metabolized into 25(OH)D, which cannot get into the cells.. For the remaining five days until the next weekly dose, the body would have no detectable vitamin D3.
Do nursing mothers need daily D3?
Breast feeding mothers could have 50-60 ng/ml of measurable 25(OH)D in their blood but no measurable vitamin D3 in their breastmilk so dosing daily is important. After vitamin D3 has been turned to 25(OH)D it cannot enter the breast milk. The only way to get vitamin D in breastmilk is by dosing daily - either by sun, diet or supplementation. Dr. Hollis' research indicated that 6,400 IU/day was necessary for breast feeding mothers.
Why does this matter for clinical trials?
Most of the clinical trials conducted in the past 40 years have focused on the endocrine system and have consistently shown the positive effects of vitamin D on bone health regardless of dosing regimen (from daily to quarterly). In the past 10 years, many new clinical trials have focused on non-skeletal outcomes such as autoimmune disorders, cancer, cardiovascular disease and infections. These new studies have also used various dosing regimens--but have yielded inconsistent results. Those with adequate daily vitamin D inputs have largely shown positive results while those with longer dosing intervals have shown no vitamin D effect. While 25(OH)D levels are maintained in these studies, it is the vitamin D3 levels that are essential to these systems. Therefore, it is necessary to design a clinical trial based on the physiology of the system of interest in order to accurately assess the effect of vitamin D in the body.
+++++ >>> "Vitamin D intakes of up to 10,000 IU/per day and circulation 25(OH)D levels of up to 100 ng/ml (250 nmol) are normal in human physiology. Do not treat as poison." - Bruce Hollis
If people did nothing but take a meaningful daily amount of Vitamin D. They would be so much healthier. If they doing OKL well they going to find VITAMIN D Amazing THE BODY is running blind when Vitamin D is inadequate ! Hence this
The analysis found that obese subjects who did not have glucose metabolism disorders had higher levels of vitamin D than diabetic subjects.
Likewise, lean subjects with diabetes or another glucose metabolism disorder were more likely to have low levels of vitamin D. Vitamin D levels were directly correlated with glucose levels, but not with BMI. “Our findings indicate that vitamin D is associated more closely with glucose metabolism than obesity,” And you will find connected to everything else too !! Vitamin D a KEY supplement (DHA and Magnesium too )
(From Edward Hutchinson) Over the last 50 years health professionals have been trying to persuade people to stay out of the sun and use high protection sunscreen.
Most people now have lower vitamin d levels than were common in previously and modern lifestyles lead to more time indoors or under cover (in cars) Vitamin d regulates intestinal permeability, Leaky gut. While it's true gluten promotes the production of zonulin, and Zonulin, is also involved in the regulation of tight junctions, and autoimmune diseases https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3384703/ It's also the case that lower vitamin d levels also lead to intestinal permeability, leaky gut. Tight junction CLDN2 gene is a direct target of the vitamin D receptor https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4650691/ If we don't keep our 25(OH)D levels at or above 125nmol/l 50ng/ml with daily vitamin d3 or Uvb exposure, we will not have freely bioavailable cholecalciferol present to maintain our endothelial barrier. Dietary Vitamin D and Its Metabolites Non-Genomically Stabilize the Endothelium https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4607301/
Vitamin D and Epilepsy
The anticonvulsive effect of vitamin D is now supported by evidence coming from different sources including ecological and clinical interventional studies as well as animal experiments. Several antiepileptic drugs, especially those with enzyme inducer properties,decrease vitamin D level which paradoxically may predispose to more seizures. These facts together with the worldwide problem of vitamin D deciency and the known relationship of insufcient vitamin D levels with the major disorders of civilization warrant routine screening and supplementation of vitamin D in epilepsy patients. Further studies are needed to more closely determine the optimal level of vitamin D from the epilepsy point of view. Epilepsy and Vitamin D (PDF Download Available). Available from: https://www.researchgate.net/publication/257070539_Epilepsy_and_Vitamin_D [accessed Sep 27, 2017].
Vitamin D and Health - Harvard School of Public Health This one mentions the studies on bone health in the elderly and the ineffectiveness of lower doses of D "Several studies link low vitamin D levels with an increased risk of fractures in older adults, and they suggest that vitamin D supplementation may prevent such fractures—as long as it is taken in a high enough dose. (9–13) A summary of the evidence comes from a combined analysis of 12 fracture prevention trials that included more than 40,000 elderly people, most of them women. Researchers found that high intakes of vitamin D supplements—of about 800 IU per day—reduced hip and non-spine fractures by 20 percent, while lower intakes (400 IU or less) failed to offer any fracture prevention benefit. (13)"
New Zealand author, Ian Wishart, has researched and written a book on vitamin D
"IF YOU STILL HAVE A HEARTBEAT, THIS BOOK IS DIRECTLY RELEVANT TO YOU
Vitamin D is the hottest development in medical science, and in this compelling new book, bestselling author Ian Wishart brings together the most up to date science on vitamin D and how it could well save your life.
Cancer? Up to a 77% reduction in risk of developing it if you take this vitamin.
Heart disease? The same kind of reduction. Did you know that autism, mental illness and multiple sclerosis all appear to be affected by a lack of vitamin D during pregnancy? Did you know that ADHD and asthma appear to result from that same deficiency?
The lives of every single person, including you, will be affected by the information in this book. More than 300 scientific studies are cited, making this an ideal reference book for the public and medical professionals alike.