Table of Contents
- My Cancer Diagnosis and Early Struggles
- Understanding Vitamin D and Its Role in Cancer
- Discovering the Importance of Vitamin D
- Deciding to Start Vitamin D Supplementation
- Incorporating Vitamin D into My Routine
- Positive Effects of Vitamin D Supplementation
- Challenges and Solutions
- Monitoring My Health with Technology
- Lessons from My Vitamin D Experience
- Advice for Others
- How Vitamin D Transformed My Cancer Journey
- References
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Vitamin D supplementation plays a vital role in supporting overall health, especially for cancer patients like me. After my diagnosis of stage IV rectal cancer and undergoing multiple treatments, I began exploring ways to strengthen my immune system and reduce cancer risk.
Maintaining optimal vitamin D levels became a critical part of my routine, as research suggests a link between vitamin D deficiency and higher cancer incidence, including colorectal cancer, breast cancer, and prostate cancer.
Through sunlight exposure, dietary vitamin sources like fatty fish, and daily vitamin D supplements, I aimed to enhance my health and reduce cancer mortality while continuing conventional treatments. This article reflects on my experience with vitamin D and cancer prevention and shares insights for others facing similar challenges.

My Cancer Diagnosis and Early Struggles
In May 2020, I was diagnosed with stage IV rectal cancer that had metastasized to my liver. The news came after weeks of unexplained symptoms, including weight loss, fatigue, and bloody stools. A colonoscopy confirmed the tumor in my rectum, while a liver ultrasound revealed multiple tumors. My cancer marker, CEA, was over 2000. These results overwhelmed me, but I knew I needed to act quickly.
The aggressive treatment plan included chemotherapy, radiation, and multiple surgeries. Each step came with challenges, from severe side effects to recurring tumors. I realized I needed more than conventional medicine to support my body through this fight. This began my search for strategies, like dietary changes and vitamin D supplementation, to strengthen my immune system and improve my resilience.
Understanding Vitamin D and Its Role in Cancer
Vitamin D is a fat-soluble vitamin essential for maintaining bone health, immune function, and overall well-being. The body produces it through sunlight exposure and obtains it from dietary sources like fatty fish, fish liver oils, and fortified foods. Vitamin D is also available as supplements, including vitamin D3, which is highly bioavailable.
Research has found a connection between vitamin D and cancer prevention. Studies suggest higher vitamin D levels may reduce cancer incidence, including colorectal cancer, breast cancer, and prostate cancer. Vitamin D receptors regulate cell growth and may help prevent cancer cell proliferation. The National Cancer Institute and other organizations highlight vitamin D's potential to lower cancer mortality and reduce the risk of developing cancer.

Discovering the Importance of Vitamin D
When my cancer recurred despite treatment, I began researching ways to support my health beyond conventional therapies. I came across studies showing how vitamin D deficiency is linked to higher cancer risks, including colorectal cancer risk and breast cancer risk. These studies highlighted the importance of achieving enough vitamin D levels to help reduce cancer incidence and improve patient outcomes.
Research from institutions like Harvard Medical School and the VITAL trial emphasized the potential benefits of daily vitamin D supplements. Findings suggested that higher doses of vitamin D could reduce cancer mortality, support the immune system, and potentially decrease the risk of advanced cancers. This evidence, combined with advice from cancer research experts, convinced me to prioritize vitamin D supplementation in my treatment plan.

Deciding to Start Vitamin D Supplementation
I decided to include vitamin D supplementation in my cancer treatment plan because of its potential to reduce cancer risk and support immune health. Research showed that vitamin D deficiency is common among cancer patients and could increase cancer mortality. Studies linking higher vitamin D levels to reduced cancer incidence, including colorectal cancer risk and breast cancer risk, convinced me that I needed to address this gap in my care.
I consulted with my oncologist about safely incorporating vitamin D supplements. We discussed the appropriate dosage to avoid high blood calcium levels and ensure it complemented my existing treatments. Based on these conversations, I began a regimen that included both dietary vitamin D sources and daily vitamin D supplements, ensuring my intake aligned with my body’s needs.

Incorporating Vitamin D into My Routine
My supplementation schedule became a structured part of my day. I prioritized taking vitamin D with meals containing healthy fats to improve absorption. Alongside vitamin D, I included other nutrient-dense foods and supplements that supported my overall health and treatment goals.
Time | Activity |
10:00 AM | Morning supplements, including Vitamin D, with 1000cc of green tea. |
10:30 AM | Half cup of kefir for gut health. |
10:50 AM | Black coffee with 10cc MCT C8 oil and a small piece of organic grass-fed butter. |
12:00 PM | Lunch with sauerkraut and 30cc olive oil, along with supplements, including Vitamin D. |
4:00 PM | Afternoon exercise to boost overall health. |
7:00 PM | Dinner with 30cc olive oil and supplements, including Vitamin D. |
11:00 PM | Evening supplements. |

Positive Effects of Vitamin D Supplementation
Incorporating vitamin D into my routine led to noticeable improvements in my health.
- Boosted Immune Function: My blood tests showed reduced inflammation markers, such as CRP, which are often elevated in cancer patients.
- Enhanced Mood and Mental Well-Being: I experienced a clearer mind and better emotional balance during treatment.
- Improved Cancer Management: While not a cure, maintaining higher vitamin D levels may have contributed to better treatment outcomes, supporting my fight against cancer progression.
- Better Overall Health: My bones felt stronger, and my energy levels improved, helping me maintain physical activity and exercise routines critical to my recovery.
Challenges and Solutions
Incorporating vitamin D into my cancer treatment plan wasn’t without challenges. I had to ensure the dosage was safe and effective, avoid potential side effects like high blood calcium levels, and find supplements from reliable sources. These difficulties required careful planning and a proactive approach to prevent setbacks.
DifficultiesSolutions
Ensuring proper dosage and avoiding side effects Regular consultations with healthcare professionals to monitor Vitamin D levels.
Finding high-quality Vitamin D supplements Selected supplements from reputable sources with third-party testing for purity.
Monitoring My Health with Technology
Tracking my health was essential for ensuring the effectiveness of vitamin D supplementation. I used the Oura Ring to monitor sleep, recovery, and overall health, helping me stay consistent with my routine. Regular blood tests checked my vitamin D levels, ensuring they remained in a healthy range to reduce cancer risk and support overall well-being. These tools gave me valuable insights and allowed me to adjust my regimen as needed.
Lessons from My Vitamin D Experience
Adding vitamin D supplementation to my cancer treatment taught me valuable lessons about health, discipline, and resilience.
- Vitamin D is Essential: Maintaining optimal levels is crucial for overall health, immune support, and potentially improving cancer outcomes.
- Consistency Matters: Regular supplementation, combined with a balanced routine, delivers the best results.
- A Holistic Approach Works: Pairing vitamin D with a nutrient-rich diet, exercise, and good sleep habits enhances its benefits.
- Monitoring is Key: Using technology and regular tests ensures a safe and effective supplementation plan.
Advice for Others
For anyone considering vitamin D supplementation as part of their cancer prevention or treatment journey, there are a few things to keep in mind. Balancing supplementation with medical advice and consistent monitoring can make all the difference in achieving the desired results.
- Consult Healthcare Professionals: Always seek guidance from a doctor before starting vitamin D supplements, especially for cancer patients.
- Start with a Recommended Dosage: Begin with a dosage based on your dietary reference intakes and adjust it as needed after regular blood tests.
- Monitor Your Progress: Use tools like blood tests to track vitamin D levels and watch for any side effects or deficiencies.
- Combine with a Healthy Lifestyle: Pair vitamin D supplementation with good nutrition, exercise, and sleep for the best outcomes.
How Vitamin D Transformed My Cancer Journey
Vitamin D supplementation became a critical part of my cancer treatment plan, helping me support my immune system, reduce inflammation, and stay resilient through challenging treatments. Regular monitoring, consistent supplementation, and advice from healthcare professionals ensured its effectiveness.
For cancer patients, achieving optimal vitamin D levels through sunlight exposure, dietary vitamin sources, or supplements can help reduce cancer incidence, improve overall health, and support ongoing treatments. My journey taught me that combining science-backed supplementation with a holistic approach is one of the most powerful tools in the fight against cancer.
References
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- Duffy M. J. (2001). Carcinoembryonic antigen as a marker for colorectal cancer: is it clinically useful?. Clinical chemistry, 47(4), 624–630. https://pubmed.ncbi.nlm.nih.gov/11274010/
- Garland, C. F., Garland, F. C., Gorham, E. D., Lipkin, M., Newmark, H., Mohr, S. B., & Holick, M. F. (2006). The role of vitamin D in cancer prevention. American journal of public health, 96(2), 252–261. https://doi.org/10.2105/AJPH.2004.045260
- Heaney, R. P., Recker, R. R., Grote, J., Horst, R. L., & Armas, L. A. (2011). Vitamin D(3) is more potent than vitamin D(2) in humans. The Journal of clinical endocrinology and metabolism, 96(3), E447–E452. https://doi.org/10.1210/jc.2010-2230
- Holick M. F. (2007). Vitamin D deficiency. The New England journal of medicine, 357(3), 266–281. https://doi.org/10.1056/NEJMra070553
- Manson, J. E., Cook, N. R., Lee, I. M., Christen, W., Bassuk, S. S., Mora, S., Gibson, H., Gordon, D., Copeland, T., D'Agostino, D., Friedenberg, G., Ridge, C., Bubes, V., Giovannucci, E. L., Willett, W. C., Buring, J. E., & VITAL Research Group (2019). Vitamin D Supplements and Prevention of Cancer and Cardiovascular Disease. The New England journal of medicine, 380(1), 33–44. https://doi.org/10.1056/NEJMoa1809944
- Nursyam, E. W., Amin, Z., & Rumende, C. M. (2006). The effect of vitamin D as supplementary treatment in patients with moderately advanced pulmonary tuberculous lesion. Acta medica Indonesiana, 38(1), 3–5. https://pubmed.ncbi.nlm.nih.gov/16479024/
- Ovesen, L., Brot, C., & Jakobsen, J. (2003). Food contents and biological activity of 25-hydroxyvitamin D: a vitamin D metabolite to be reckoned with?. Annals of nutrition & metabolism, 47(3-4), 107–113. https://doi.org/10.1159/000070031
- Vieth R. (1999). Vitamin D supplementation, 25-hydroxyvitamin D concentrations, and safety. The American journal of clinical nutrition, 69(5), 842–856. https://doi.org/10.1093/ajcn/69.5.842
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