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Vitamin D: An Evidence-Based Review – 2009

Teresa Kulie, MD,
Amy Groff, DO,
Jackie Redmer, MD, MPH,
Jennie Hounshell, MD and
Sarina Schrager, MD, MS
Department of Family Medicine, University of Wisconsin, Madison
Corresponding author: Sarina Schrager, MD, MS, Department of Family Medicine, University of Wisconsin, 777 S. Mills St., Madison, WI 53715 (E-mail: sbschrag at wisc.edu)

Vitamin D is a fat-soluble vitamin that plays an important role in bone metabolism and seems to have some anti-inflammatory and immune-modulating properties. In addition, recent epidemiologic studies have observed relationships between low vitamin D levels and multiple disease states. Low vitamin D levels are associated with increased overall and cardiovascular mortality, cancer incidence and mortality, and autoimmune diseases such as multiple sclerosis. Although it is well known that the combination of vitamin D and calcium is necessary to maintain bone density as people age, vitamin D may also be an independent risk factor for falls among the elderly. New recommendations from the American Academy of Pediatrics address the need for supplementation in breastfed newborns and many questions are raised regarding the role of maternal supplementation during lactation. Unfortunately, little evidence guides clinicians on when to screen for vitamin D deficiency or effective treatment options.

Causes table 2 from deep inside the article

Causes Example
Reduced skin synthesis Sunscreen, skin pigment, season/latitude/time of day, aging, skin grafts
Decreaseed absorption Cystic fibrosis, celiac disease, whipple disease, Crohn disease, gastric bypass, medications that reduce cholesterol absorption
Increased sesquestration Obesity
Increased catabolism Anticonvulsant, glucocorticoid, highly active antiretroviral treatment, and some immunosuppressants
Breastfeeding
Decreased synthesis of
25-hydroxyvitamin D
Hepatic failure
Increased urinary loss of
25-hydroxyvitamin D
Nephrotic proteinuria
Decreased synthesis of 1,25-dihydroxyvitamin D Chronic renal failure
Heritable disorders Genetic mutations causing rickets, or vitamin D resistance
Acquired disorders Tumor-induced osteomalacia, primary hyperparathyroidism, hyperthyroidism, granulomatous disorders such as sarcoidosis, tuburculosis, and some lymphomas


PDF is attached at bottom of this page

Background and Physiology

Vitamin D is a hormone precursor that is present in 2 forms. Ergocalciferol, or vitamin D2, is present in plants and some fish. Cholecalciferol, or vitamin D3, is synthesized in the skin by sunlight. Humans can fulfill their vitamin D requirements by either ingesting vitamin D or being exposed to the sun for enough time to produce adequate amounts. Vitamin D controls calcium absorption in the small intestine and works with parathyroid hormone to mediate skeletal mineralization and maintain calcium homeostasis in the blood stream. In addition, recent epidemiologic studies have observed relationships between low vitamin D levels and multiple disease states, probably caused by its anti-inflammatory and immune-modulating properties and possible affects on cytokine levels.

Vitamin D3 can be manufactured in the skin by way of ultraviolet (UV) B rays. UVB rays are present only during midday at higher latitudes and do not penetrate clouds. The time needed to produce adequate vitamin D from the skin depends on the strength of the UVB rays (ie, place of residence), the length of time spent in the sun, and the amount of pigment in the skin. Tanning beds provide variable levels of UVA and UVB rays and are therefore not a reliable source of vitamin D.

Vitamin D3 is synthesized from 7-dehydrocholesterol in the skin. The vitamin D binding protein transports the vitamin D3 to the liver where it undergoes hydroxylation to 25(OH)D (the inactive form of vitamin D) and then to the kidneys where it is hydroxylated by the enzyme 1 ?hydroxylase to 1,25(OH)D, its active form.1 This enzyme is also present in a variety of extrarenal sites, including osteoclasts, skin, colon, brain, and macrophages, which may be the cause of it's broad-ranging effects.1 The half-life of vitamin D in the liver is approximately 3 weeks, which underscores the need for frequent replenishment of the body's supply.
Vitamin D and Mortality

Vitamin D may be a determinant of mortality because of its anti-inflammatory and immune-modulating effects. It has been used to treat secondary hyperparathyroidism in people on dialysis. Retrospective trials show that vitamin D supplementation is associated with decreased mortality in people on dialysis.2 Low serum vitamin D levels are also related to increased mortality in most patients with chronic kidney disease before dialysis.3 However, there have been no randomized prospective trials examining this relationship.4

In patients not on dialysis, low vitamin D levels are associated with increased levels of inflammation and oxidative load. A prospective study of more than 3000 male and female patients scheduled for coronary angiography found a positive association between low vitamin D levels and cardiovascular as well as all-cause mortality.5 Data analysis from the National Health and Nutrition Examination Survey III (more than 13,000 adults) showed that people with vitamin D levels in the lowest quartile had a mortality rate ratio of 1.26 (95% CI, 1.08–1.46).6 A recent meta-analysis demonstrated that intake of a vitamin D supplement at normal doses also was associated with decreased all-cause mortality rates.7 These data suggest that vitamin D may play a part in multiple causes of death, although causality has not been determined.
Vitamin D and Cardiovascular Disease

Vitamin D receptors are present in vascular smooth muscle, endothelium, and cardiomyocytes and may have an impact on cardiovascular disease. Observational studies have shown a relationship between low vitamin D levels and blood pressure, coronary artery calcification, and existing cardiovascular disease. A large cohort study that included more than 1700 participants from the Framingham offspring study looked at vitamin D levels and incident cardiovascular events.8 During a period of 5 years, participants who had 25-OH D levels of <15 were more likely to experience cardiovascular events (hazard ratio, 1.62; 95% CI, 1.11–2.36). The relationship remained significant among people with hypertension but not among those without hypertension.8

Vitamin D and Diabetes


Recent studies in animal models and humans have suggested that vitamin D may also play a role in the homeostasis of glucose metabolism and the development of type 1 and type 2 diabetes mellitus (DM). Epidemiologic data has long suggested a link between exposure to vitamin D early in life and the development of type 1 DM.9,10 Vitamin D3 receptors have strong immune-modulating effects. In some populations the development of type 1 DM is associated with polymorphisms in the vitamin D receptor gene.11,12 There is also some evidence that increased vitamin D intake by infants may reduce the risk of the development of type 1 DM.13

Vitamin D has recently been associated with several of the contributing factors known to be linked to the development of type 2 DM, including defects in pancreatic ?cell function, insulin sensitivity, and systemic inflammation. Several physiologic mechanisms have been proposed, including the effect of vitamin D on insulin secretion, the direct effect of calcium and vitamin D on insulin action, and the role of this hormone in cytokine regulation.9,12,13 Although most studies indicating this relationship are observational, one meta-analysis showed a relatively consistent association between low vitamin D status, calcium or dairy intake, and prevalence of type 2 DM or metabolic syndrome. The study concluded that the highest type 2 DM prevalence, 0.36 (95% CI, 0.16–0.80), among participants who were not black was associated with the lowest blood levels of 25-hydroxyvitamin D. In addition, metabolic syndrome prevalence of 0.71 (95% CI, 0.57–0.89) was highest among those with the lowest dairy intake. There was also an inverse relationship between type 2 DM and metabolic syndrome incidences and vitamin D and calcium intake.14

Vitamin D and Osteoporosis


Osteoporosis is the most common metabolic bone disease in the world. A low vitamin D level is an established risk factor for osteoporosis. Inadequate serum vitamin D levels will decrease the active transcellular absorption of calcium.

Although combination calcium and vitamin D supplementation is associated with higher bone mineral density and decreased incidence of hip fractures,15 the evidence for vitamin D supplementation alone is less clear. A recent evidence summary found that vitamin D supplementation at doses of more than 700 IU daily (plus calcium) prevented bone loss compared with placebo.16 However, vitamin D supplementation (300 to 400 IU daily) without calcium did not affect fractures.16 A Cochrane review found unclear evidence that vitamin D alone affected hip, vertebral, or other fracture rates but supported the use of vitamin D with calcium in frail, elderly nursing home residents.17 A subsequent meta-analysis of trials looking at vitamin D and fracture rates concurred that calcium was also necessary to affect a significant difference.18

The most recent meta-analysis of 12 randomized, controlled trials that included more than 42,000 people found that vitamin D supplementation of more than 400 IU daily slightly reduced incidence of nonvertebral fractures (rate ratio, 0.86; 95% CI, 0.77–0.96).19 The effect was dose dependent and was not significant if doses were ?400 IU daily.
Vitamin D and Falls among the Elderly

Vitamin D status is increasingly recognized as an important factor in fall status among elderly patients. Several trials have demonstrated that vitamin D supplementation decreases the risk of falling. One proposed mechanism is that higher vitamin D levels are associated with improved muscle function.

A randomized, controlled trial from Australia evaluated women with at least one fall in the preceding 12 months and with a plasma 25-hyroxyvitamin D level <24.0 ng/mL.20 All women were given calcium 1000 mg per day and were randomized to receive either ergocalciferol 1000 IU per day or placebo. Women in the study group had fewer falls after 12 months, but this was not a significant difference (53% versus 62.9%; odds ratio, 0.66; 95% CI, 0.41–1.06). After correction for height difference in the 2 groups, the ergocalciferol group had a significantly lower risk of falling (odds ratio, 0.61; 95% CI, 0.37–0.99).

A dose of 800 IU daily significantly reduced the risk of falling compared with a placebo in a dose-stratified analysis of the effect of 5 months of vitamin D supplementation on fall risk (72% lower incidence rate ratio; rate ratio, 0.28; 95% CI, 0.10–0.75). Lower doses of vitamin D, however, did not significantly change the rate of fall incidence compared with placebo.21

A review of 12 randomized, controlled trials studying the effect of vitamin D supplementation on fall risk among both nursing home residents and community dwellers found a small benefit of supplementation on fall risk (odds ratio, 0.89; 95% CI, 0.80–0.99),9 an effect that was also shown in a review of randomized, controlled trials with strict inclusion criteria, which included 1237 men and women with a mean age of 70 years and supplementation for 2 months to 3 years. The pooled results showed a significant 22% decrease in fall risk among those treated with vitamin D versus placebo or calcium only. The number needed to treat from the pooled results was 15 to prevent 1 person from falling22 Assessing vitamin D levels in a population at high risk for falling and supplementing with 800 to 1000 IU daily of vitamin D should be a part of any fall prevention program.

Vitamin D and Cancer


Both observational studies in humans and animal models support that vitamin D has a beneficial role in cancer prevention and survival. The mechanism of action is probably related to its role in the regulation of cell growth and differentiation.23 In the Health Professionals Follow-Up study (a cohort study of 1095 men), each increment in 25(OH)D level of 25mmol/L was associated with a 17% reduction of total cancer cases.24 However, the National Health and Nutrition Examination Survey of 16,818 men and women did not find a relationship between total cancer mortality and vitamin D level. There was an inverse relationship between vitamin D level and colorectal cancer, however. In this study, serum 25(OH)D levels of ?80 nmol/L conferred a 72% reduction in risk of colorectal cancer compared with a level lower than 50 nmol/L.25

A recent meta-analysis of 63 observational studies looked at the relationship between vitamin D levels and cancer incidence and mortality.26 Twenty of the 30 studies looking at vitamin D and colon cancer showed that people with higher vitamin D levels had either a lower incidence of colon cancer or decreased mortality. Similarly, 9 of the 13 studies about breast cancer and 13 of the 26 studies about prostate cancer showed beneficial effects of vitamin D levels on cancer incidence or mortality (some of the studies included more than one type of cancer).26

A population-based randomized, control trial found that postmenopausal women who were supplemented with calcium and vitamin D had a reduced risk of cancer after the first year of treatment (rate ratio, 0.232; 95% CI, 0.09–0.60).27 There was not a group that was supplemented with vitamin D alone.
Vitamin D and Multiple Sclerosis

Multiple sclerosis (MS) is a neurodegenerative, T lymphocyte-mediated, autoimmune disease of uncertain etiology. Although genetic susceptibility may be involved, epidemiologic studies suggest environmental influence because the development of MS correlates most strongly with rising latitude in both the northern and southern hemispheres.28 Migration studies show that risk can be modified at an early age from both low to high and high to low prevalence rates.28 Exposure to sun in early childhood is associated with reduced risk of developing MS29 and population-based studies about MS in Canada have also shown that birth timing is a risk factor for MS because there are statistically significantly fewer patients with MS born in November and more born in May compared with controls.30 A birth-timing association suggests that seasonality and sunlight exposure may also have an effect on the developing fetus in utero.30,31

Several studies have shown that vitamin D affects the growth and differentiation of immune-modulator cells such as macrophages, dendritic cells, T cells, and B cells.32–34 This immune-modulatory effect has implications for a variety of autoimmune diseases including rheumatoid arthritis, systemic lupus erythematosous, type I DM, inflammatory bowel disease, and MS.33

Despite the wealth of epidemiologic studies supporting a relationship between vitamin D and MS in humans, data showing a link between serum vitamin D levels and MS are only beginning to emerge. One prospective, nested, case-control study examined the serum samples of 7 million military veterans and compared serum samples of 257 MS patients before diagnosis with those of matched controls.35 An inverse relationship between vitamin D levels and MS risk was found, particularly for vitamin D levels measured in patients younger than 20. Another case-control study compared the serum vitamin D levels of 103 MS patients with 110 controls and found that for every 10-nmol/L increase of serum 25(OH)D level the odds of MS was reduced by 19% in women, suggesting a “protective” effect of higher vitamin D levels.36 In addition, a negative correlation was found between Expanded Disability Status Scale scores among female MS patients and 25(OH)D levels. Several other studies have supported the finding that lower levels of vitamin D in MS patients are associated with more severe disability.37 Lower levels during relapses have also been reported in patients with relapse-remitting MS.38–40

The potential effects of oral vitamin D intake have been observed in several different ways. A Norwegian case-control study found that fish and cod liver oil have a protective effect against the development of MS.29 A large observational study in the United States that followed 2 large cohorts of women—the Nurses’ Health Study (92,253 women followed from 1980 to 2000) and the Nurses’ Health Study II (95,310 women followed from 1991 to 2001)—found that vitamin D supplementation in the form of a multivitamin seemed to lower their MS risk by 40%.41 However, several methodological weaknesses in study design made the results inconclusive.42

Despite the overwhelming amount of data describing the association between vitamin D and MS, there is a paucity of research describing the benefit of vitamin D supplementation to these patients. One small safety study of 12 patients taking 1000 ?g per day (40,000 IU) of vitamin D for 28 weeks showed a decline in the number of gadolinium-enhancing lesions on magnetic resonance imaging per patient; this led to a 25(OH)D serum concentration of 386 nmol/L (158 ng/mL) without causing hypercalcemia, hypercalciuria, or other complication.43
Vitamin D and Cognition

Observational studies have shown that people with Alzheimer dementia have lower vitamin D levels than do matched controls without dementia.44 The biological plausibility of this relationship includes vitamin D's antioxidative effects and the presence of vitamin D receptors in the hippocampus, which has been seen in rats and humans.44 A cross-sectional study of 225 outpatients diagnosed with Alzheimer disease found a correlation between vitamin D levels (but not other vitamin levels) and their score on a Mini Mental Status Examination.45

Vitamin D and Chronic Pain


Because of the important role vitamin D plays in bone homeostasis, some have questioned whether vitamin D deficiency may also correlate with chronic pain syndromes, including chronic low back pain. Several case series and observational studies have suggested that vitamin D inadequacy may represent a source of nociception and impaired neuromuscular functioning among patients with chronic pain.

The data to support this conclusion are mixed. A recent review of 22 relevant studies found no convincing link between prevalence and latitude and no association between serum levels of 25-OH vitamin D in chronic pain patients and controls. Interestingly, though, there was a contrast in treatment effects between randomized, double-blind trials that minimized bias and those with studies known to be subject to bias. In those that blinded the vitamin D therapy, only 10% of patients were in trials showing a benefit of vitamin D treatment, whereas among those who did not blind the treatment 93% were in trials showing a benefit of vitamin D supplementation.46

A second review examined the role of vitamin deficiency in patients from outpatient and inpatient rehab units. Fifty-one articles were reviewed and a direct correlation was noted between vitamin D deficiency and musculoskeletal pain. Treatment of vitamin D deficiency produced an increase in muscle strength and a marked decrease in back and lower-limb pain within 6 months.47 Although these data were suggestive of a link between vitamin D and pain, the available evidence does not imply causality. The verdict on this topic will remain undecided until this is evaluated by double-blind, randomized, controlled trials stratified by baseline vitamin D level with defined treatments and comparison placebo groups.

Vitamin D Supplementation for Infants and Breastfeeding Mothers


Breast milk is an ideal form of nourishment for a newborn. Because of most nursing mother's own vitamin D deficiency, however, and despite the mother taking a prenatal vitamin, breast milk alone is not sufficient to maintain newborn vitamin D levels within a normal range.48 Many nursing mothers or their infants require vitamin D supplementation for optimal health.49

In 2003, the American Academy of Pediatrics recommended that 200 IU of vitamin D be used as supplementation for all infants beginning during the first 2 months after birth.50 More recently, in 2008 the recommendation has been increased to a minimum of 400 IU daily during the first days of life to prevent vitamin D deficiency that may lead to rickets.48

A 2004 systematic review looked at 166 cases of nutritional rickets diagnosed between 1986 and 2004 in 17 states from the mid-Atlantic region to Texas and Georgia. A disproportionate number of rickets cases were found in African-American, breastfed infants.51 In addition to rickets and the risk of developing type I DM, other pediatric and adult health conditions may be impacted by insufficient vitamin D levels in infants and their mothers.52 Both bone mineral accrual in early childhood53 and the risk of recurrent wheezing episodes in children at age 354 were linked to insufficient vitamin D intake by women during pregnancy. If a fetus or breastfeeding infant receives an inadequate amount of vitamin D from its mother it can have a direct impact on the baby's health as an adult. Because of these findings, in 2007 the Canadian Pediatric Society recommended 2000 IU of vitamin D3 for pregnant and lactating mothers with periodic blood tests to check levels of 25 (OH)D and calcium.52 The American Academy of Pediatrics recommendations focus on supplementing the infant and make no specific recommendations about universally supplementing breastfeeding mothers.48
Supplementing the Newborn: 2008 Recommendations from the American Academy of !!Pediatrics

The American Academy of Pediatrics recommends supplementing all children who are exclusively breastfed with 400 IU of vitamin D from the first few days of life. Children who are fed by breast and formula or who are exclusively formula fed should also be supplemented until they are consistently ingesting 1 L of formula a day (approximately 1 quart). The supplementation should continue until 1 year of age, when children begin ingesting vitamin D-fortified milk.48 All formulas sold in the United States contain at least 400 IU/L of vitamin D3; therefore, 1 L per day would meet the vitamin D recommendations set by the American Academy of Pediatrics.55

Preparations for Supplementation


There are many available preparations for newborns (Table 1). Some companies make a single-drop preparation that contains 400 IU, but caution should be used when prescribing this product because of the ease of dispensing too much vitamin D to a newborn with just a few drops.48

Table 1.

Vitamin D Preparations for Newborns
Checking Serum Levels in Infants

Clinicians should obtain a serum vitamin D level (25-OH-D not 1,25-OH2-D) among infants with malabsorption disorders or who take anticonvulsants because they may need additional supplementation above 400 IU daily. Actual values of 25-OH-D that determine vitamin D insufficiency in children have not been defined. The ?20 ng/mL of 25-OH-D that determines a sufficient vitamin D level for adults has been used for children.48

Supplementing Breastfeeding Mothers


Mothers who were supplemented with 400 IU of vitamin D daily produced milk with vitamin D levels that ranged from <25 to 78 IU per liter.48 Supplementing the mother alone with 400 IU—equivalent to a prenatal vitamin—produced inadequate vitamin D levels in the breastfed infants.55 A randomized, controlled trial evaluated 19 breastfeeding mothers who were supplemented with 6000 IU of vitamin D3 and a prenatal vitamin with 400 IU of vitamin D. The vitamin D levels found in their breast milk and in the exclusively breastfed infants themselves were found to be equivalent to the infants who received oral supplementation (300 IU per day). This level of maternal supplementation showed no toxic effects and provided adequate vitamin D to nursing infants without needing to supplement the infant.56 Safety and efficacy of this dosing during pregnancy and lactation has not been confirmed. In the meantime, screening high-risk women is appropriate and supplementing breastfeeding women who are vitamin D3 deficient is warranted.57

Testing for Vitamin D Deficiency


There are many causes of vitamin D deficiency, as listed in (Table 2),59 and despite growing attention to this deficiency, there are no established guidelines to help clinicians decide which patients warrant screening laboratory testing. The US Preventive Services Task Force does not comment for or against routine screening for vitamin D deficiency. One approach is to consider serum testing in patients at high risk for vitamin D deficiency but treating without testing those at lower risk.
Table 2.

Causes of Vitamin D Deficiency58

An Australian working group issued a position statement itemizing groups of people at risk for vitamin D deficiency. The risk groups include: (1) older people in low- and high-level residential care; (2) older people admitted to hospital; (3) patients with hip fracture; (4) dark-skinned women (particularly if veiled); and (5) mothers of infants with rickets (particularly if dark-skinned or veiled).58

If electing to test vitamin D status, serum 25-hydroxyvitamin D is the accepted biomarker.60 Although 1,25-OH-D is the active circulating form of vitamin D, measuring this level is not helpful because it is quickly and tightly regulated by the kidney. True deficiency would be evident only by measuring 25-OH-D. Of note, questions have been raised regarding the need for standardization of assays.61 A large laboratory (Quest Diagnostics) recently reported the possibility of thousands of incorrect vitamin D level results.62 Sunlight exposure questionnaires are imprecise and are not currently recommended.63

Controversy exists regarding the optimum level of serum 25-hydroxyvitamin D in a healthy population. Most experts agree that serum vitamin D levels <20 ng/mL represent deficiency. However, some experts recommend aiming for a higher minimum target level of 30 ng/mL of 25-hydroxyvitamin D49 in a healthy population. Vitamin D intoxication can occur when serum levels are greater than 150 ng/mL. Symptoms of hypervitaminosis D include fatigue, nausea, vomiting, and weakness probably caused by the resultant hypercalcemia. Of note, sun exposure alone cannot lead to vitamin D intoxication as excess vitamin D3 is destroyed by sunlight.

Treatment


Given concern about skin cancer, many patients and clinicians are cautious regarding sun exposure recommendations. However, exposure of arms and legs for 5 to 30 minutes between the hours of 10 am and 3 pm twice a week can be adequate to prevent vitamin D deficiency.59

Natural dietary sources of vitamin D include salmon, sardines, mackerel, tuna, cod liver oil, shiitake mushrooms, and egg yolk.58 Fortified foods include milk, orange juice, infant formulas, yogurts, butter, margarine, cheeses, and breakfast cereals.59

Over-the-counter multivitamin supplements frequently contain 400 IU of vitamins D1, D2, or D3. Alternatively, over-the-counter vitamin D3 supplements can be found in 400, 800, 1000, and 2000 IU strengths. Prescription-strength supplementation choices include vitamin D2 (ergocalciferol), which provides 50,000 IU per capsule, and vitamin D2 liquid (drisdol) at 8000 IU/mL.59

To prevent vitamin D deficiency in healthy patients, the 1997 Institute of Medicine recommendations suggested a daily vitamin D intake of 200 IU for children and adults up to 50 years of age; 400 IU for adults 51 to 70 years of age; and 600 IU for adults 71 years or older.64 The upper limit recommended was 2000 IU daily. However, some experts consider this to be too low and recommend that children and adults without adequate sun exposure consume 800 to 1000 IU daily to achieve adequate serum vitamin D levels.59

Treatment recommendations vary depending on the cause of the deficiency. For example, patients with chronic kidney disease are recommended to have 1000 IU of vitamin D3 daily.59 The expected blood level response to a given vitamin D dose varies, probably because of differences in the cause of the deficit as well as the starting point for correction. A recent editorial reported that supplemental intakes of 400 IU per day of vitamin D increase 25(OH)D concentrations by only 2.8 to 4.8 ng/mL (7–12 nmol/L) and that daily intakes of approximately 1700 IU are needed to raise these concentrations from 20 to 32 ng/mL (50–80 nmol/L).65 Responses to vitamin D supplementation or sun exposure may vary by patient, so clinicians may need to continue to monitor abnormal levels.

Revision received July 10, 2009. Accepted for publication July 13, 2009.
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