Overview

SCIENTIFIC SCORE
Questionable
Based on 29 Researches
6.8
USERS' SCORE
Good
Based on 21 Reviews
8
Supplement Facts
Serving Size:   1 Softgel
Amount Per Serving
%DV
Vitamin D3 (as Cholecalciferol) (from Lanolin)
125 mcg (5,000 IU)
625%

Top Medical Research Studies

We examined the relationship between vitamin D intake and breast cancer, delving into how this vitamin may play a role in prevention and management. The findings suggest that vitamin D may have a protective effect, potentially lowering the risk of developing breast cancer.

While we found a notable connection, it’s important to recognize that most of the existing evidence comes from observational studies. This means we can identify associations but cannot definitively say that vitamin D causes these effects.

Additionally, there are several complexities in studying vitamin D, such as varying metabolism and differences in study designs, which make drawing firm conclusions challenging.

Although the research provides intriguing insights, more rigorous studies are necessary to truly clarify how vitamin D could be integrated into breast cancer care moving forward.
Read More
8
Vitamin D impacts breast cancer outcomes
We explored how vitamin D (VD) levels might impact breast cancer (BC) patients undergoing neoadjuvant chemotherapy (NACT). The study reviewed data from six different research projects involving patients who had confirmed diagnoses of BC and had their vitamin D levels measured before starting chemotherapy.

Our analysis revealed some intriguing findings. Specifically, maintaining adequate vitamin D levels appeared to lower the chances of not responding to neoadjuvant chemotherapy by 22%. Additionally, those with sufficient vitamin D experienced a 35% reduced risk of disease progression compared to those with low or deficient levels. This suggests that vitamin D might play a beneficial role in improving treatment outcomes for breast cancer patients.

Overall, these results underscore the importance of keeping vitamin D levels within a healthy range during cancer treatment. They encourage us to delve deeper into how vitamin D influences cancer biology and its potential as a supportive therapy in breast cancer management.
Read More
We explored the connection between vitamin D levels and muscle strength in women with breast cancer. This research involved adult women who had been diagnosed with breast cancer within the last 12 months, ensuring that none had metastases or recurrences. Our focus was on understanding how inadequate vitamin D might relate to reduced muscle strength in this specific group.

We discovered that a significant portion of the participants, around 70%, had insufficient levels of vitamin D. This deficiency was notably linked to lower muscle strength, as indicated by the Handgrip Strength test. Specifically, the findings showed that women with insufficient vitamin D were more likely to fall into the lower muscle strength categories.

The study sheds light on the importance of monitoring vitamin D levels in women battling breast cancer. Given the link between low vitamin D and weaker muscle strength, addressing this deficiency might offer a new avenue for improving overall health and vitality in these patients.
Read More

Most Useful Reviews

7.5
Fights cancer risks
12 people found this helpful
The lanolin composition is good. No vitamin impacts health like Vitamin D. Research shows that it may prevent SARS and lowers risks of various cancers, including breast cancer. I bought Vitamin D3 to take during the pandemic. The tablets are easy to swallow, ideally taken with fatty foods. I take 5000 units.
Read More
9
Improves fertility and health
7 people found this helpful
Vitamin D benefits include enhanced sperm health and prevention of prostate cancer, contributing to overall well-being. I encourage men to recognise the significant advantages of this nutrient.
Read More
7.5
Supports cancer prevention
6 people found this helpful
The lanolin composition is good. Vitamin D remains unparalleled in health benefits. Research indicates it may reduce the risk of cancers, including breast cancer. I bought Vitamin D3 for the pandemic. The small tablets are easy to swallow and should be taken with fatty foods; I take 5000 units.
Read More

Medical Researches

SCIENTIFIC SCORE
Questionable
Based on 29 Researches
6.8
  • All Researches
9
Vitamin D3 reduces breast cancer invasion
We set out to explore how Vitamin D3, when combined with gold nanoparticles (VD3-GNPs), could influence breast cancer's aggressiveness. Our research focused on breast cancer cell lines, specifically MCF-7 and MDA-MB-231, to see if this innovative treatment could significantly reduce cancer cell migration and invasion.

Through a series of methods including Western blots and migration/invasion assays, we observed that the VD3-GNP treatment led to an impressive reduction in cancer aggressiveness, with migration and invasion rates dropping by over 45%. This effect seems to come from the downregulation of key pathways associated with cancer growth and spread, namely the PI3K/AKT/mTOR pathway, as well as ETV7 and the Hippo pathway.

What's particularly surprising is the fact that we achieved these results using a relatively low dose of Vitamin D3—three orders of magnitude lower than doses used in past studies. This makes VD3-GNPs an appealing option for non-toxic and cost-effective treatments aimed at combating breast cancer's aggressive nature.
Read More
9
Vitamin D3 enhances breast cancer treatment
We aimed to understand how vitamin D3 influences breast cancer treatment by testing it alongside doxorubicin (Dox) and probiotics using a group of mice. The study involved female BALB/c mice that were divided into various groups to see how these treatments affected tumor growth and overall health compared to a control group.

Our findings showed that the combinations of Dox with vitamin D3 and probiotics significantly reduced tumor size and weight, indicating that vitamin D3 may enhance the effectiveness of breast cancer chemotherapy. The study also found that these combinations had protective effects against the toxicity typically caused by Dox. Especially notable was the increase in genes associated with tumor reduction and a decrease in those linked to cancer cell survival.

However, it’s essential to note that this study focused on the combined effects of vitamin D3, probiotics, and Dox, which makes it challenging to isolate the specific impact of vitamin D3 alone on breast cancer outcomes. Overall, the results suggest that incorporating vitamin D3 into breast cancer treatment protocols could be beneficial, particularly in combination with other agents.
Read More
We aimed to understand how EB1089, a vitamin D3 analog, influences the treatment of HER2-positive breast cancer when combined with established therapies like lapatinib and antiestrogens. In our research, we used two types of breast cancer cells—BT-474 and SK-BR-3—both of which are HER2-positive but have differing estrogen receptor statuses.

Our findings revealed that EB1089 significantly boosted the antiproliferative effects of lapatinib when used together with antiestrogens. Notably, in the SK-BR-3 cells, which are estrogen receptor-negative, EB1089 successfully restored the effectiveness of antiestrogen treatment. This shows that EB1089 plays a pivotal role in enhancing cell growth inhibition in HER2-positive breast cancer cells.

Additionally, we discovered that this analog modulated the expression of the estrogen receptor alpha protein and reduced Akt phosphorylation, contributing to its effects. Overall, our investigation highlights the potential of incorporating vitamin D3 analogs like EB1089 into existing cancer treatment regimens, opening new avenues for managing HER2-positive breast cancer more effectively.
Read More
9
Combination therapy shows promise
We investigated the potential impact of 1,25 dihydroxycholecalciferols, commonly known as vitamin D3, alongside genistein, a dietary phytoestrogen, on breast cancer cell lines, specifically MCF-7 and MDA-MB-231. Our research focused on their ability to inhibit cancer cell growth, progression, and metastasis, both individually and in combination.

Through a series of assays, including flow cytometry and cell invasion tests, we observed that vitamin D3 and genistein were effective in reducing cell proliferation. Notably, they prompted the cancer cells to enter a resting phase and triggered the process of apoptosis, or programmed cell death. We found that this was linked to increased expression of certain genes like BAX and CASP3 and decreased levels of the BCL-2 gene, a key player in cell survival.

Interestingly, both compounds also showed promise in curbing metastasis. They enhanced the expression of E-cadherin, a protein that helps cells stick together, while reducing the expression of other proteins associated with cancer spread. Furthermore, these treatments also positively influenced key protein expressions that enhance cancer response and overall survivability.

Ultimately, our findings suggest that vitamin D3, especially in combination with genistein, holds potential as a candidate for breast cancer treatment. However, given the combined approach, isolating the effects of vitamin D3 alone remains challenging, which adds complexity to our understanding.
Read More
9
Vitamin D3 inhibits breast cancer growth
We explored the role of vitamin D3, or cholecalciferol, in combating breast cancer through a comprehensive study involving breast cancer cell lines and a mouse model called Ehrlich ascites carcinoma (EAC). To understand how vitamin D3 might affect cancer, we monitored its effects on both estrogen receptor-positive and negative cell lines in vitro, noting that these cells absorbed around 50% of vitamin D3 during a 48-hour incubation period.

Our results showcased that vitamin D3 significantly slowed down the proliferation of breast cancer cells in a dose-dependent manner, with effective inhibitory concentrations ranging from 0.10 to 0.35 mM. Prolonged exposure didn’t seem to boost its effectiveness, suggesting an optimal treatment window. Notably, vitamin D3 prompted cell cycle arrest and apoptosis—two crucial mechanisms for controlling cancer growth—through the regulation of specific proteins like p53, cyclin-D1, and Bcl2.

Furthermore, vitamin D3 demonstrated its potential as an anti-angiogenic agent by impeding blood vessel growth both in vitro and during experiments with chorioallantoic membranes. In our in vivo approach, administering vitamin D3 intraperitoneally in mice led to reduced tumor growth and body weight gain.

Overall, the findings indicate that vitamin D3 can exert cytotoxic effects on breast cancer cells and may serve as a valuable player in cancer therapy strategies. This prompts further investigation into its therapeutic applications against breast cancer.
Read More

User Reviews

USERS' SCORE
Good
Based on 21 Reviews
8
  • All Reviews
  • Positive Reviews
  • Negative Reviews
7.5
Fights cancer risks
12 people found this helpful
The lanolin composition is good. No vitamin impacts health like Vitamin D. Research shows that it may prevent SARS and lowers risks of various cancers, including breast cancer. I bought Vitamin D3 to take during the pandemic. The tablets are easy to swallow, ideally taken with fatty foods. I take 5000 units.
Read More
9
Improves fertility and health
7 people found this helpful
Vitamin D benefits include enhanced sperm health and prevention of prostate cancer, contributing to overall well-being. I encourage men to recognise the significant advantages of this nutrient.
Read More
7.5
Supports cancer prevention
6 people found this helpful
The lanolin composition is good. Vitamin D remains unparalleled in health benefits. Research indicates it may reduce the risk of cancers, including breast cancer. I bought Vitamin D3 for the pandemic. The small tablets are easy to swallow and should be taken with fatty foods; I take 5000 units.
Read More
9
Vital for disease prevention
2 people found this helpful
This Vitamin D is very popular for a reason: it effectively maintains healthy levels, reducing the risk of numerous diseases, including breast cancer. Maintaining optimum levels is essential for overall health.
Read More
9
Combats cancer types
1 people found this helpful
Everyone should have Vitamin D pills. It protects against various cancers, particularly breast cancer, and helps maintain heart health and blood pressure. Vitamin D also plays a significant role in diabetes prevention by stimulating insulin production.
Read More

Frequently Asked Questions

7.5
Supports breast cancer
210 people found this helpful
Vitamin D3 5000 IU is crucial for numerous bodily functions. It aids calcium absorption, supports immunity, and enhances mood. Research indicates that a Vitamin D3 level of 60 ng/ml can significantly reduce the risk of breast cancer. Many individuals in Eastern Europe have low levels of Vitamin D, which poses serious health risks. I recommend consulting a doctor for proper blood tests and adjusted dosages, especially when combating breast cancer.
9
Reduces breast cancer risk
4 people found this helpful
Vitamin D is a powerful anti-cancer agent, significantly lowering the risk of breast cancer. Maintaining a sufficient level prior to illness is crucial for maximising health benefits.
9
Supports cancer recovery
1 people found this helpful
This NOW brand Vitamin D has improved my levels significantly. I take it daily, and my doctor endorses it for boosting immunity, especially as a cancer survivor.
6
Essential for cancer management
4 people found this helpful
Despite seeming high, 5000 IU of Vitamin D is often recommended by doctors for cancer maintenance. I believe it's vital for those dealing with cancer, guided by medical advice.
9
Enhances immunity
1 people found this helpful
Everyone should take Vitamin D! It’s known that many in Siberia lack this vitamin. Even young children are recommended to take it! This vitamin boosts immunity and may prevent cancer cell growth. Don't skimp on your health!
7.5
Powerful against breast cancer
41 people found this helpful
Vitamin D serves as a potent anti-cancer nutrient. Studies suggest that high doses significantly impact conditions like breast cancer. If taking large quantities, ensure to combine it with Vitamin K to maintain proper balance.
9
Supports breast cancer
1 people found this helpful
Excellent! Vitamin D is vital for bone health, has anti-cancer properties, and supports the immune system. If my 25 (OH) D level is low, I take 5000 IU daily. The optimal level is 50-70, at which point 1000-2000 IU is recommended. Sun exposure is an additional source of Vitamin D, but sunscreen can hinder this. I suggest taking 225 mg of zinc, 30,000 IU of vitamin D3, and 500 mg of vitamin C upon signs of infection. If this review was helpful, please click "Yes".
Our study focused on the potential link between vitamin D levels and breast cancer among women. We conducted a cross-sectional analysis involving 40 women diagnosed with breast cancer and compared their serum vitamin D levels to a matched control group of 40 women without the disease.

The results were quite compelling. We found that the average levels of vitamin D were significantly lower in women with breast cancer, which raises interesting questions about vitamin D deficiency as a risk factor for this cancer. Specifically, women with breast cancer averaged about 31.9 ng/mL of vitamin D, while those without the disease measured around 37.98 ng/mL.

Notably, half of the women in the breast cancer group were found to be vitamin D deficient, whereas only 27.5% of the control group faced the same issue. Additionally, we observed a correlation between lower vitamin D levels and various socio-economic factors among breast cancer patients.

While these findings suggest a potential connection between low vitamin D levels and breast cancer risk, it’s essential to approach this topic with cautious optimism. Further research is needed to fully understand this relationship and the possible benefits of vitamin D enrichment on breast cancer prevention.
8
Vitamin D impacts breast cancer outcomes
We explored how vitamin D (VD) levels might impact breast cancer (BC) patients undergoing neoadjuvant chemotherapy (NACT). The study reviewed data from six different research projects involving patients who had confirmed diagnoses of BC and had their vitamin D levels measured before starting chemotherapy.

Our analysis revealed some intriguing findings. Specifically, maintaining adequate vitamin D levels appeared to lower the chances of not responding to neoadjuvant chemotherapy by 22%. Additionally, those with sufficient vitamin D experienced a 35% reduced risk of disease progression compared to those with low or deficient levels. This suggests that vitamin D might play a beneficial role in improving treatment outcomes for breast cancer patients.

Overall, these results underscore the importance of keeping vitamin D levels within a healthy range during cancer treatment. They encourage us to delve deeper into how vitamin D influences cancer biology and its potential as a supportive therapy in breast cancer management.
We examined the relationship between vitamin D intake and breast cancer, delving into how this vitamin may play a role in prevention and management. The findings suggest that vitamin D may have a protective effect, potentially lowering the risk of developing breast cancer.

While we found a notable connection, it’s important to recognize that most of the existing evidence comes from observational studies. This means we can identify associations but cannot definitively say that vitamin D causes these effects.

Additionally, there are several complexities in studying vitamin D, such as varying metabolism and differences in study designs, which make drawing firm conclusions challenging.

Although the research provides intriguing insights, more rigorous studies are necessary to truly clarify how vitamin D could be integrated into breast cancer care moving forward.

References

  1. Schömann-Finck M, Vogt T, Reichrath J. Umbrella Review on the Relationship Between Vitamin D Intake and Cancer. Anticancer Res. 2025;45:855. 10.21873/anticanres.17474
  2. Soni D, Tiwari A, Kushwah PS, Dubey S, Khan S. Levels of Serum 25-Hydroxy Vitamin D in Benign and Malignant Breast Disease Patients: An Observational Study. Cureus. 2025;17:e78283. 10.7759/cureus.78283
  3. Pereira da Silva Garcia MR, Rechinelli AB, Minto Dos Santos D, Abdala Nogueira Souza J, Barcellos Leite da Silva L, et al. Low Serum Vitamin D Levels Are Associated with Reduced Muscle Strength in Women with Breast Cancer. Nutr Cancer. 2025. 10.1080/01635581.2025.2471621
  4. Hutajulu SH, Aresy S, Astari YK, Wiranata JA, Puspitaningtyas H, et al. Severe Deficiency of Vitamin D and Anthracycline-Taxane Regimen are associated with Cachexia Following Breast Cancer Chemotherapy: A Single Center Assessment Using Two Consensus-Based Criteria. Asian Pac J Cancer Prev. 2025;26:189. 10.31557/APJCP.2025.26.1.189
  5. Momivand M, Razaghi M, Mohammadi F, Hoseinzadeh E, Najafi-Vosough R. The status of serum 25(OH)D levels is related to breast cancer. Cancer Treat Res Commun. 2024;42:100870. 10.1016/j.ctarc.2025.100870
  6. Shu C, Yang Q, Huang J, Xie X, Li H, et al. Pretreatment plasma vitamin D and response to neoadjuvant chemotherapy in breast cancer: evidence from pooled analysis of cohort studies. Int J Surg. 2024;110:8126. 10.1097/JS9.0000000000002142
  7. Gao C, Jian C, Wang L, Liu Y, Xiong Y, et al. FAP-targeting biomimetic nanosystem to restore the activated cancer-associated fibroblasts to quiescent state for breast cancer radiotherapy. Int J Pharm. 2025;670:125190. 10.1016/j.ijpharm.2025.125190
  8. Ottaiano A, Facchini BA, Iacovino M, Santorsola M, Facchini S, et al. Impact of Vitamin D Levels on Progression-Free Survival and Response to Neoadjuvant Chemotherapy in Breast Cancer Patients: A Systematic Review and Meta-Analysis. Cancers (Basel). 2024;16. 10.3390/cancers16244206
  9. Almassri HF, Abdul Kadir A, Srour M, Foo LH. The Effects of Omega-3 Fatty Acids and Vitamin D Supplementation on the Nutritional Status of Women with Breast Cancer in Palestine: An Open-Label Randomized Controlled Trial. Nutrients. 2024;16. 10.3390/nu16223960
  10. Bissan ADT, Amegonou AEH, Sidibé FM, Ly M, Barry NOK, et al. [Vitamin D Deficiency In Advanced Breast Cancer Risk In Mali]. Mali Med. 2024;39:50.
  11. Almassri HF, Abdul Kadir A, Srour M, Foo LH. The effects of Omega-3 fatty acids and vitamin D supplementation on the quality of life and blood inflammation markers in newly diagnosed breast cancer women: An open-labelled randomised controlled trial. Clin Nutr ESPEN. 2025;65:64. 10.1016/j.clnesp.2024.11.014
  12. Abdollahi S, Vahdat M, Saeedirad Z, Mahmoudi Z, Torkaman M, et al. Multifaceted Role of Vitamin D in Breast Cancer: A Systematic Review of Genetic and Pathway-Based Mechanisms. Asian Pac J Cancer Prev. 2024;25:3349. 10.31557/APJCP.2024.25.10.3349
  13. Wu S, Ma XD, Zhang XM, Shi C, Du KY, et al. Genetic evidence supporting the causal role of 25-hydroxyvitamin D levels in the prognosis of ER- breast cancer: A Mendelian randomization study. Medicine (Baltimore). 2024;103:e40262. 10.1097/MD.0000000000040262
  14. Yum C, Andolino C, Larrick B, Sheeley MP, Teegarden D. 1α,25-Dihydroxyvitamin D Downregulates Adipocyte Impact on Breast Cancer Cell Migration and Adipokine Release. Nutrients. 2024;16. 10.3390/nu16183153
  15. Stachowicz-Suhs M, Łabędź N, Milczarek M, Kłopotowska D, Filip-Psurska B, et al. Vitamin D reduces the expression of M1 and M2 macrophage markers in breast cancer patients. Sci Rep. 2024;14:22126. 10.1038/s41598-024-73152-x
  16. Tirgar A, Rezaei M, Ehsani M, Salmani Z, Rastegari A, et al. Exploring the synergistic effects of vitamin D and synbiotics on cytokines profile, and treatment response in breast cancer: a pilot randomized clinical trial. Sci Rep. 2024;14:21372. 10.1038/s41598-024-72172-x
  17. Zárate-Pérez A, Cruz-Cázares AP, Ordaz-Rosado D, García-Quiroz J, León-Del-Rio A, et al. The vitamin D analog EB1089 sensitizes triple-negative breast cancer cells to the antiproliferative effects of antiestrogens. Adv Med Sci. 2024;69:398. 10.1016/j.advms.2024.08.004
  18. Pereira TSS, Marques SSA, Olandoski M, Polakowski CB, Beltrame OC, et al. Vitamin D and Breast Cancer Risk: Evaluating the Association and Effective Risk Reduction. Breast Care (Basel). 2024;19:197. 10.1159/000539750
  19. Bernhardt SM, Ozaki MK, Betts C, Bleyle LA, DeBarber AE, et al. Altered liver metabolism post-wean abolishes efficacy of vitamin D for breast cancer prevention in a mouse model. bioRxiv. 2024. 10.1101/2024.05.28.596304
  20. McGuinness JE, Anderson GL, Mutasa S, Hershman DL, Terry MB, et al. Effects of vitamin D supplementation on a deep learning-based mammographic evaluation in SWOG S0812. JNCI Cancer Spectr. 2024;8. 10.1093/jncics/pkae042
  21. Roy M, Hussain F. Mitigation of Breast Cancer Cells' Invasiveness via Down Regulation of ETV7, Hippo, and PI3K/mTOR Pathways by Vitamin D3 Gold-Nanoparticles. Int J Mol Sci. 2024;25. 10.3390/ijms25105348
  22. Kim S, Chen N, Reid P. Current and future advances in practice: aromatase inhibitor-induced arthralgia. Rheumatol Adv Pract. 2024;8:rkae024. 10.1093/rap/rkae024
  23. Mirzadeh MA, Eslami M, Ghanbari A, Zarbakhsh S, Yosefi S, et al. Coadministration of doxorubicin with vitamin D3, Lactobacillus acidophilus, and Lactobacillus casei in the 4T1 mouse model of breast cancer: anticancer and enteroprotective effects. Med Oncol. 2024;41:111. 10.1007/s12032-024-02346-0
  24. Achounna AS, Ordaz-Rosado D, García-Quiroz J, Morales-Guadarrama G, Milo-Rocha E, et al. EB1089 Increases the Antiproliferative Response of Lapatinib in Combination with Antiestrogens in HER2-Positive Breast Cancer Cells. Int J Mol Sci. 2024;25. 10.3390/ijms25063165
  25. Łabędź N, Anisiewicz A, Stachowicz-Suhs M, Banach J, Kłopotowska D, et al. Dual effect of vitamin D on breast cancer-associated fibroblasts. BMC Cancer. 2024;24:209. 10.1186/s12885-024-11961-z
  26. Stachowicz-Suhs M, Łabędź N, Anisiewicz A, Banach J, Kłopotowska D, et al. Calcitriol promotes M2 polarization of tumor-associated macrophages in 4T1 mouse mammary gland cancer via the induction of proinflammatory cytokines. Sci Rep. 2024;14:3778. 10.1038/s41598-024-54433-x
  27. Alatawi FS, Faridi U. Anticancer and anti-metastasis activity of 1,25 dihydroxycholecalciferols and genistein in MCF-7 and MDA-MB-231 breast cancer cell lines. Heliyon. 2023;9:e21975. 10.1016/j.heliyon.2023.e21975
  28. Tahmasebi M, Veissi M, Hosseini SA, Jamshidnezhad A. Effect of vitamin D supplementation on inflammatory markers and total antioxidant capacity in breast cancer women using a machine learning technique. Explor Target Antitumor Ther. 2023;4:1059. 10.37349/etat.2023.00180
  29. Veeresh PKM, Basavaraju CG, Dallavalasa S, Anantharaju PG, Natraj SM, et al. Vitamin D3 Inhibits the Viability of Breast Cancer Cells In Vitro and Ehrlich Ascites Carcinomas in Mice by Promoting Apoptosis and Cell Cycle Arrest and by Impeding Tumor Angiogenesis. Cancers (Basel). 2023;15. 10.3390/cancers15194833
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