Here’s a list of studies about vitamin D and osteoporosis / osteopenia:

Vitamin D Status Among Patients with Hip Fracture and Elderly Control Subjects in Yekaterinburg, Russia (2006)

Conclusion: 63 elderly people with hip fractures were analyzed. They had lower average vitamin D levels and vitamin D deficiencies were more common in comparison to a control group of independently living elderly people.


Calcium plus Vitamin D Supplementation and the Risk of Fractures (2006)

Conclusion: A ten-year randomized control trial involving 36,000 elderly women found that those receiving a low dose of vitamin D and calcium supplements had higher bone density and suffered slightly fewer fractures compared to the placebo group.


The Prevalence of Vitamin D Inadequacy Amongst Women with Osteoporosis: An International Epidemiological Investigation (2006)

Conclusion: Of 2,606 postmenopausal osteoporotic women from 18 different countries at a variety of latitudes, 64% were vitamin D-deficient. Vitamin D deficiency is common among osteoporotic women.


Prevalence of Vitamin D Inadequacy Among Postmenopausal North American Women Receiving Osteoporosis Therapy (2005)

Conclusion: More than half of North American women receiving therapy to treat or prevent osteoporosis have vitamin D inadequacy”


Fracture Prevention With Vitamin D Supplementation: A Meta-analysis of Randomized Controlled Trials (2005)

Conclusion: Oral vitamin D supplementation between 700 to 800 IU/d appears to reduce the risk of hip and any nonvertebral fractures in ambulatory or institutionalized elderly persons.”


Calcium, Vitamin D, Milk Consumption, and Hip Fractures: A Prospective Study Among Postmenopausal Women (2003)

Conclusion: “An adequate vitamin D intake is associated with a lower risk of osteoporotic hip fractures in postmenopausal women.”


Osteoporosis and Vitamin-D Deficiency Among Postmenopausal Women with Osteoarthritis Undergoing Total Hip Arthroplasty (2003)

Conclusion: Vitamin D deficiency is common among women suffering from osteoarthritis.


Calcium Absorption Varies Within the Reference Range for Serum 25-Hydroxyvitamin D (2003)

Conclusion: Researches found from two experiments that increasing people’s vitamin D levels significantly improves calcium absorption.


Resolution of Vitamin D Insufficiency in Osteopenic Patients Results in Rapid Recovery of Bone Mineral Density (1999)

Conclusion: Vitamin D therapy proved to be effective for significantly increasing bone density in 12 osteoporosis patients.


Effect of Calcium and Vitamin D Supplementation on Bone Density in Men and Women 65 Years of Age or Older (1997)

Conclusion: In a 3-year, double-blind, placebo-controlled trial involving 389 elderly people, the group being treated with calcium and vitamin D had better bone density and fewer nonvertebral fractures at the end of the three years compared to the placebo group.


Effects of 2 Years’ Treatment of Osteoporosis with 1 Alpha-Hydroxy Vitamin D3 on Bone Mineral Density and Incidence of Fracture: A Placebo-Controlled, Double-Blind Prospective Study (1996)

Conclusion: A  two-year randomized control trial involving 113 female osteoporotic patients found that those receiving supplemental vitamin D daily enjoyed higher bone density and suffered fewer fractures than the placebo group.


Vitamin D3 and Calcium to Prevent Hip Fractures in Elderly Women (1992)

Conclusion: In an 18-month-long randomized control trial experiment involving 3,270 elderly women, participants being treated with supplemental calcium and vitamin D suffered 32% fewer nonvertebral fractures compared to a placebo group.


Subclinical Vitamin D Deficiency in Postmenopausal Women with Low Vertebral Bone Mass (1991)

Conclusion: Lower vertebral bone mass is correlated with low vitamin D levels in postmenopausal women.


Relation of Fractional 47Ca Retention to Season and Rates of Bone Loss in Healthy Postmenopausal Women (1991)

Conclusion: A study of 58 postmenopausal women over a two-year period found that their calcium retention was higher August-October. This is a time of year when people’s vitamin D levels tend to be highest. The study also found that their calcium retention was lower March-May, after coming out of winter when people’s vitamin D levels tend to be lower. Seasonal changes in calcium retention and bone loss are strongly correlated with seasonal changes in population vitamin D levels.


Seasonal Variation of Lumbar Spine Bone Mineral Content in Normal Women (1983)

Conclusion: Women’s bones tend to be stronger at the end of summer compared to the end of winter. This correlates with the well-documented seasonal changes in population vitamin D levels.


Seasonal Variation in Serum 25-Hydroxycholecalciferol in Healthy People (1978)

Conclusion: Vitamin D levels were checked in 232 South African elderly femoral neck fracture patients. The blood tests performed closest to the hospital admissions found that the majority of them were deficient. Further study and follow up found that their vitamin D levels were highest in the summer and autumn months.


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