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Vitamin D has key impact in performance of soldiers.  low vitamin D has been shown to be associated with increased risk for muscle/bone injury, weakness, and poor healing.  Low vitamin D has been associated with low Testosterone.  Low vitamin D has also been associated with poor cognition, depression and less than optimal recovery after TBI.  This follows recent publication that normalization of vitamin D levels increases Testosterone levels.  

Higher vitamin D levels associated with lower death rates from breast cancer.  In fact, people with the highest levels of vitamin D had death rates cut in half.  The authors point to 3 ares that vitamin D has a positive effect against cancer: differentiation, apoptosis, and angiogenesis.

Good article on the immunomodulation effect of vitamin D.  The importance of vitamin D goes back to pregnancy.   Vitamin D deficiencies during pregnancy inhibit appropriate invariant Natrual killer cells, which play important regulatory effect in autoimmune disease.  Even with restoration of vitamin D levels with replacement, the full positive effects of vitamin D are not seen due to limited iNKT potential.

ibuprofen alters genetic expression that results in decreased Testosterone production.

Fascinating link between vitamin D and mitochondria function in skeletal muscle.  Vitamin D replacement was found to improve mitochondrial function, improve post exercise discomfort in those with vitamin D deficiency.  Obviously, this provides support for a link between vitamin D and mitochondrial function.  This could provide an important tool in the recovery phase in athletes.

Another ill conceived conclusion by the authors.  IF you are going to study something, know everything about it.  They authors make a major statement about vitamin D, yet they seem to understand a basic understanding of vitamin dosing.  The authors stated that dosing 2,000 IU of vitamin D in those with levels < 50 provided no benefit.  That is of course correct, because 2,000 IU daily won't hold any levels stable, let alone increase levels to 70-80 where they need to be.  The authors of this study are stuck in the traditional RDC thinking here. What is interesting is that low vitamin D was associated with CVD, MS, dyslipidemia, inflammation, glucose dysmetabolism, infections, mood disorders, decline in cognition, impaired physical functioning, and all-cause mortality,  But, vitamin D supplementation is only good for bones.  The authors of this study make a mockery of medicine.

Good review of data on vitamin D, Vitamin D receptors and cancer risk.  Studies have shown that low Vitamin D levels are associated with increased cancer risk and that higher vitamin D levels are associated with reduced cancer risk.  The ability to fully map out vitamin Ds role in the physiology is probably difficult due to the heterogeneity of cancer development and physiology.

Study of 713 Chinese men finds a correlation between low vitamin D and low total Testosterone.

hypercalcemia in cancer and treatments.

Vitamin D supplementation in those individuals with SLE found to benefit these patients.   Vitamin D found to reduce TH1 and Th17 activity.  It also was found to decrease memory B cells and auto-antibodies.  Also of note is the level of vitamin D after therapy-only at 51.4 at 2 months and 41.5 at 6 months.

Low vitamin D levels or the receptors for vitamin D appear to result in an increase in Th17 cells.  An increase in Th17 cells will lead to an imbalance with Treg cells and this imbalance is associated with Lupus and other autoimmune processes.  Vitamin D inhibits Th17 cell activation.

Dose dependent vitamin D impact on fat.  Low vitamin D concentrations associated with fat adipogenesis.  Higher vitamin D concentrations inhibited adipogenesis.

d-chiro-inositol levels shown to be low in diabetics.  Thus, d-chiro-inositol would prove to be helpful in diabetes management.  D-chiro-inositol is a secondary messenger in insulin signaling

A large body of evidence exists to associate low vitamin D with cardiovascular disease.  However, this review finds no causal relationship.  Is vitamin D an indicator of poor health?  Or is it the cause of poor health.  Yet to be determined.  Is vitamin D safe? Yes.

What is Vitamin D

Alzheimer's model finds that amyloid-beta supresses vitamin D receptor.  This study found that vitamin D therapy protected neurons by up regulating vitamin D receptors.  This prevented cytotoxicity and cell death.

vitamin D in those with vitamin D deficiency and insulin resistance have improved insulin sensitivity.  The doses used in the case studies presented are low.  This article highlights the fact that vitamin D outperforms metformin in improved insulin sensitivity.

European study showed that vitamin D replacement in those with low vitamin D levels, had benefits of lowered blood pressure.

Vitamin D levels are inversely associated with respiratory infections.  The lower your vitamin D, the higher your risk of respiratory infections.

vitamin D deficiency predisposes children to the respiratory problems commonly found in the winter months.  Vitamin D shown to reduce the incidence of such respiratory infections (cold, flu...)