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Vitamin D and calcium supplementation in women undergoing pharmacological management for postmenopausal osteoporosis: a level I of evidence systematic review

Abstract

The present systematic review investigates whether different doses of vitamin D and calcium supplementation in women with postmenopausal osteoporosis undergoing antiresorptive therapy have an association with BMD (spine, hip, femur neck), serum markers of osteoporosis (bone-ALP, NTX, CTX), the rate of pathological vertebral and non-vertebral fractures, adverse events, and mortality. This systematic review was conducted according to the PRISMA 2020 guidelines. PubMed, Google Scholar, Embase, and Scopus databases were accessed in September 2024. All randomised clinical trials (RCTs) comparing two or more treatments for postmenopausal osteoporosis supplemented with vitamin D and/or calcium were accessed. Only studies that indicated daily vitamin D and/or calcium supplementation doses were accessed. Data from 37 RCTs (43,397 patients) were retrieved. Patients received a mean of 833.6 ± 224.0 mg and 92.8 ± 228.7 UI of calcium and vitamin D supplementation, respectively. The mean length of the follow-up was 25.8 ± 13.3 months. The mean age of the patients was 66.4 ± 5.6 years, and the mean BMI was 25.2 ± 1.6 kg/m2. There was evidence of a statistically significant negative association between daily vitamin D supplementation and gastrointestinal adverse events (r = − 0.5; P = 0.02) and mortality (r = − 0.7; P = 0.03). No additional statistically significant associations were evidenced. In postmenopausal women who undergo antiresorptive treatment for osteoporosis, vitamin D was associated with a lower frequency of gastrointestinal adverse events and mortality. Calcium supplementation did not evidence an association with any of the endpoints of interest.

Level of evidence Level I, systematic review of RCTs.

Introduction

Osteoporosis is a metabolic bone disease characterised by loss of bone mineral density (BMD) and bone mass and deterioration of bone microarchitecture, increasing the risk of fracture [1,2,3]. The prevalence of osteoporosis is very high, and the social and economic impact associated with osteoporosis-related fractures is particularly significant [4, 5]. The rate of bone loss increases with advancing age, especially in the first few menopausal years, constituting a major concern for women warranting the term postmenopausal osteoporosis (PMO) [6,7,8,9]. Since calcium and vitamin D play a synergistic role in preventing BMD loss and maintaining bone homeostasis [10,11,12], deficiency of these elements, especially in the elderly, is likely associated with alterations in bone remodelling and poor skeletal muscle health [13,14,15]. A diet rich in calcium and vitamin D appears to have a favourable impact on BMD. Since vitamin D status is critical for calcium absorption, the combined intake of these micronutrients could prevent hip fractures in postmenopausal women [3, 16, 17]. Pharmacological management of osteoporosis includes bisphosphonates, highly effective antiresorptive agents, as first-line therapy [18,19,20]. However, their effects vary among patients with a risk of treatment failure and adverse events [21, 22]. Given the chronic nature of osteoporosis, long-term treatment is necessary. Therefore, it becomes essential to identify therapeutic approaches that can complement drug therapy effectively and well-tolerated. Calcium and vitamin D supplements have been proposed as an anti-osteoporotic therapy recommended for their potential to reduce fracture rates in both institutionalised elderly and community-dwelling patients [23,24,25]. In PMO, combining vitamin D supplementation and bisphosphonates increases the efficacy of anti-osteoporotic treatment [26]. Vitamin D appears to play a role in enhancing the bisphosphonate tail effect on BMD after discontinuation of drug therapy [27]. However, although most randomised clinical trials (RCTs) have evaluated the efficacy and safety of antiresorptive drugs in patients receiving calcium and vitamin D supplementation, international guidelines now recommend individualising the use of these micronutrients according to risk factors for their insufficiency [28, 29]. Meta-analyses of RCTs reported only a weak effect on the occurrence of fractures and have drawn attention to possible side effects of calcium supplements previously ignored [30]. The role of calcium and vitamin D supplementation in the management of osteoporosis remains controversial, and data on the efficacy and safety effects in women with PMO undergoing antiresorptive treatment are lacking [31, 32].

The present systematic review investigates whether different doses of vitamin D and calcium supplementation in postmenopausal women undergoing antiresorptive therapy for osteoporosis are associated with BMD (spine, hip, femur, neck), serum markers of osteoporosis (bone-ALP, NTX, CTX), the rate of pathological fractures (vertebral and non-vertebral), adverse events, and mortality.

Method

Search strategy

This systematic review was conducted according to the PRISMA 2020 guidelines [33]. The PICOT algorithm was preliminarily established:

  • P (Population): postmenopausal osteoporosis;

  • I (Intervention): antiresorptive treatments;

  • C (Comparison): vitamin D and calcium supplementation;

  • O (Outcomes): BMD, serum markers, pathological fractures, adverse events, mortality;

  • T (Type of study): RCT.

Data source and extraction

Two authors (G.C. and M.M.) independently performed the literature search in September 2024. The following databases were accessed: PubMed, Google Scholar, Embase, and Scopus. The following keywords were used in combination: osteoporosis, vitamin D, calcium, treatment, management, drug, pharmacology, pharmacological, medicament, mineral, density, bone, BMD, postmenopausal, spine, pathological, fragility, fractures, hip, vertebral, disability, adverse events. The same authors independently performed the initial screening. The full text was accessed if the title and abstract matched the topic of interest. A cross reference of the bibliographies was also performed.

Eligibility criteria

All randomised controlled trials (RCTs) comparing two or more treatments for postmenopausal osteoporosis supplemented with vitamin D and/or calcium were accessed. Only studies that stated daily vitamin D and/or calcium supplementation doses were accessed. According to the authors’ language capabilities, English, French, German, Italian, Portuguese and Spanish articles were eligible. Only RCTs level I evidence, according to the Oxford Centre of Evidence-Based Medicine [34], were considered. Articles including patients with glucocorticoid-induced osteoporosis were excluded. Studies conducted on patients with tumours and/or bone metastases and studies reporting data on patients with iatrogenic-induced menopausal and those on paediatric and/or adolescent patients were not included. Studies regarding selected patients undergoing immunosuppressive therapies or organ transplantation were not considered. Studies reporting data on combined therapy with multiple anti-osteoporotic or experimental drugs were also not included. Only articles reporting quantitative data under the outcomes of interest were eligible.

Outcomes of interest

Two authors (F.M. and G.C.) independently examined the resulting articles for inclusion criteria. Study generalities (author, year, journal, length of the follow-up) and baseline demographic information were collected: the number of patients and relative mean age, mean bone mass index (BMI), mean BMD (spine, hip, femur neck), antiresorptive therapy. The outcome of interest was whether different doses of vitamin D and calcium supplementation have an association with BMD (spine, hip, femur neck), serum markers of osteoporosis (bone-ALP, NTX, CTX, PINP), the rate of pathological fractures (vertebral and non-vertebral), adverse events, and mortality.

Methodology quality assessment

The risk of bias summary tool of the Review Manager Software (The Nordic Cochrane Collaboration, Copenhagen) was used to assess the methodological quality of the article included in the present systematic review. The following risks of bias were evaluated: selection, detection, attrition, and other sources of bias.

Statistical analysis

The statistical analysis was performed by the main author (F.M.). The STATA Software/MP version 16 (StataCorporation, College Station, Texas, USA) was used for the statistical analyses. For descriptive statistics, the arithmetic mean and standard deviation were evaluated. The baseline comparability was assessed using the unpaired t-test, with P values > 0.1 considered satisfactory. A multivariate analysis diagnostic was used to analyse the association between the doses of vitamin D and calcium supplementation and the variables of BMD (spine, hip, and femur neck), serum markers of osteoporosis (bone-ALP, NTX, CTX), the rate of pathological fractures, adverse events, and death. Within studies, data concerning control groups or treatment arms which did not meet the inclusion criteria were not included in the statistical analyses. The Pearson product-moment correlation coefficient (r) was used. The linear regressions were evaluated according to the Cauchy–Schwarz inequality: + 1 (positive linear correlation) and − 1 (negative linear correlation). Values of 0.1 <|r|< 0.3, 0.3 <|r|< 0.5, and |r|> 0.5 were considered to have weak, moderate, and strong correlations, respectively. Overall significance was evaluated through the χ2 test. Values of P < 0.05 were considered statistically significant.

Results

Search result

A total of 6953 articles were identified from the four searched databases. Of them, 2962 studies were excluded as duplicates. An additional 3936 studies were excluded for the following reasons: not matching the topic (N = 1918), not reporting the exact amount of daily vitamin D and/or calcium (N = 1705), poor level of evidence (N = 149), referring to glucocorticoid-induced osteoporosis (N = 95), including patients with combined therapy with multiple anti-osteoporotic or experimental drugs (N = 21) language limitation (N = 19), including patients undergoing immunosuppressive therapies or organs transplantation (N = 13), including paediatric and/or adolescent patients with iatrogenic-induced menopausal (N = 9), including patients with tumours and/or bone metastases (N = 7). A further 18 articles were not eligible as they did not report quantitative data on the outcomes of interest. Finally, 37 RCTs were included in the present study (Fig. 1).

Fig. 1
figure 1

Flowchart of the literature search

Methodological quality assessment

The risk of bias summary evidenced the strengths of the present study. First, the choice to include only RCTs reflected the low risk of selection bias. In addition, most patients and assessors were blinded, which resulted in a moderate–low risk of detection and performance bias. The high quality of the included studies also showed a low risk of attrition and reporting bias. In conclusion, the methodological assessment reported an overall low bias risk, leading to a very good methodological assessment (Fig. 2).

Fig. 2
figure 2

Methodological quality assessment

Patient demographics

Data from 43,397 patients were retrieved. Patients received a mean of 833.6 ± 224.0 mg and 92.8 ± 228.7 UI of calcium and vitamin D supplementation, respectively. The mean length of the follow-up was 25.8 ± 13.3 months. The mean age of the patients was 66.4 ± 5.6 years, and the mean BMI was 25.2 ± 1.6 kg/m2. Study characteristics and patient data at baseline are shown in detail in Table 1.

Table 1 Study characteristics and patient data at baseline of the included studies

Outcomes of interest

There was evidence of a statistically significant negative association between daily vitamin D supplementation and gastrointestinal adverse events (r = − 0.5; P = 0.02) and mortality (r = − 0.7; P = 0.03). No additional statistically significant associations were evidenced (Table 2).

Table 2 Results of the multivariate analyses

Discussion

According to the published level I of evidence articles, in postmenopausal women who undergo antiresorptive treatment for osteoporosis, vitamin D was associated with a lower frequency of gastrointestinal adverse events and mortality. Calcium supplementation did not evidence an association with any of the endpoints of interest.

Poor vitamin D status, identified by low serum levels of 25-hydroxyvitamin D (25(OH)D), has been associated with poor skeletal muscle health. Therefore, vitamin D, like calcium, has long been identified as a key element in preventing and treating bone loss and bone diseases such as osteoporosis [72]. A diet rich in calcium and vitamin D appears to have a favourable impact on BMD. Since vitamin D status is critical for calcium absorption, combining these micronutrients could prevent hip fractures in postmenopausal women [16]. However, the data available to date are conflicting, partly because of the heterogeneity of the studies regarding sample size and length of follow-up. In addition, one of the most debated issues concerns the variability of vitamin D dosages used. Some studies may not have revealed a significant effect, having probably used inadequate doses not commensurate with patients' needs. On the other hand, excess vitamin D might have less than positive effects, leading to reduced BMD and increased risk of fractures [16].

The present study found a statistically significant negative association between daily vitamin D supplementation and mortality. This is an important finding because the strong association between osteoporosis and fracture risk, especially in older adults, consequently increases patients’ morbidity and mortality [73]. Some observational studies have shown a possible association between low vitamin D status and increased mortality [74, 75]. However, this association may be nonlinear and appears lost at serum 25(OH)D concentrations above 87.5 nmol/L [76]. Vitamin D might significantly improve the survival of elderly subjects living in institutional care. Notably, this finding was independent of the baseline vitamin D status [77]. In postmenopausal women with osteoporosis, vitamin D supplements could be associated with decreased mortality [78]. However, several randomised controlled trials (RCTs) have reported only a trend toward reduced mortality without reaching statistical significance [78, 79]. The influencing factors are undoubtedly multiple, including the variable age of study participants and supplement dosage, so the relationship linking them to total mortality rates remains to be clarified. Given the strong interaction between calcium and vitamin D, a major concern is whether the beneficial effects on improved skeletal health attributed to vitamin D may result from concomitant calcium supplementation [80]. LaCroix et al. [81] performed a thorough analysis to evaluate the effects of combined supplementation of vitamin D and calcium in 36,282 postmenopausal women aged 51–82 years already enrolled in the “Women's Health Initiative (WHI) trial of CaD”, which had shown non-significant reductions in all-cause mortality [79]. Calcium/vitamin D supplementation reduced the risk of all-cause, cardiovascular, and cancer death in women younger than 70. In contrast, in older women, this combined treatment was only associated with a reduction in cancer mortality [81]. It is essential to monitor treatment adherence, as age did not influence the effects on mortality. Still, calcium and vitamin D supplements reduced all-cause mortality rates in women who adhered to this treatment. In this large RCT, as in other studies, the effects of vitamin D could not be distinguished from those of calcium, and notably, fixed dosages of 1000 mg of calcium carbonate and 400 IU of vitamin D3 were used. Based on this evidence, the results of WHI CaD appear to be inconclusive [81], and whether vitamin D given as monotherapy or combined with calcium may be able to reduce all-cause mortality remains an open question.

The present study demonstrates that, in contrast to findings related to vitamin D, the use of calcium supplements was not associated with either mortality or the other endpoints evaluated. Indeed, beneficial effects were found in mixed populations, including women with postmenopausal osteoporosis, subjects receiving combined vitamin D and calcium supplementation and those treated with vitamin D only [82,83,84,85]. A recent meta-analysis suggested that vitamin D supplementation between 700 and 800 IU/d (but not at lower doses) should reduce the risk of hip and non-vertebral fractures by about 25% in subjects aged 60. However, the authors did not define the role (if any) of concomitant calcium supplementation [83].

Another question is the safety profile of supplementation. The present systematic review found no association between calcium supplementation and side effects. In contrast, the use of vitamin D was associated with a lower frequency of gastrointestinal toxicity. The risk of kidney stones is common in patients taking calcium and vitamin D supplements simultaneously, while gastrointestinal side effects have been reported in patients taking calcium [83]. While vitamin D supplementation may reduce cardiovascular risk, calcium supplementation may increase it [86]. Calcium-related gastrointestinal toxicity, which is very common, is associated with an unfavourable risk–benefit profile that often leads to poor long-term therapeutic adherence. As a result, some authors suggest that calcium supplementation should not be recommended [87].

This study has some limitations. Variability in the mean follow-up (6 to 48 months) was evident. A shorter follow-up might reduce the efficacy of the present research in identifying the rate of pathologic fractures and their association with vitamin D and calcium doses. Another limitation is that in all included studies, vitamin D was taken together with calcium, so it is not possible to assess clearly whether the association between vitamin D supplementation and reduced mortality rate would have been found in the absence of calcium supplementation. On the other hand, because calcium and vitamin D play a synergistic role in preventing BMD loss and maintaining homeostasis and bone health, most osteoporotic patients use these supplements concomitantly.

Conclusion

In postmenopausal women receiving antiresorptive treatment for osteoporosis, vitamin D was associated with a lower frequency of gastrointestinal adverse events and mortality. Calcium supplementation showed no association with any of the endpoints of interest. Since calcium absorption depends on vitamin D status and given the favourable benefit/risk profile associated with vitamin D supplementation, vitamin D as monotherapy or calcium co-administration appears superior to calcium supplements alone.

Availability of data and materials

No datasets were generated or analysed during the current study.

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FM: conception and design, statistical analysis, drafting (original and revision); NM: supervision, drafting (revision); VC: drafting (original); GC: literature search, study selection and data extraction, risk of bias assessment; MKM: literature search, study selection and data extraction, risk of bias assessment; AF: supervision, drafting (revision). All authors have agreed to the final version to be published and agree to be accountable for all aspects of the work.

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Correspondence to Filippo Migliorini.

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Migliorini, F., Maffulli, N., Colarossi, G. et al. Vitamin D and calcium supplementation in women undergoing pharmacological management for postmenopausal osteoporosis: a level I of evidence systematic review. Eur J Med Res 30, 170 (2025). https://doiorg.publicaciones.saludcastillayleon.es/10.1186/s40001-025-02412-x

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