The Vitamin That Slashes Colon Cancer Risk by 58%
Dr. Joseph Mercola - Take Control of Your Health
Briana Mercola
4.6 • 1.5K Ratings
🗓️ 26 June 2025
⏱️ 8 minutes
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Summary
Story at-a-glance
- New research involving over 1.3 million people shows that higher blood levels of vitamin D are linked to up to 58% lower risk of colorectal cancer, especially in women
- A whopping 80% of adults are either deficient or insufficient in vitamin D, which significantly increases their risk of developing colorectal cancer over time
- Vitamin D helps slow cancer cell growth, support gut health, and reduce inflammation — factors that are all important in preventing tumor formation in the colon
- Getting regular sun exposure or supplementing with vitamin D has been shown to reduce the risk of polyps and tumors, even in people with a genetic risk for colon cancer
- Testing your vitamin D levels and correcting deficiencies through sunlight, supplements, or food is one of the most powerful and low-cost ways to reduce your colon cancer risk
Transcript
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| 0:00.0 | Welcome to Dr. Mercola's cellular wisdom. Stay informed with quick, easy-to-listen |
| 0:06.1 | summaries of our latest articles, perfect for when you're on the go. No reading required. Subscribe |
| 0:11.2 | for free at Mercola.com for the latest health insights. Are you among the four and five adults |
| 0:17.6 | who don't have enough vitamin D, unknowingly allowing your risk of colorectal |
| 0:22.0 | cancer to soar? Welcome to Dr. Mercola's cellular wisdom. I'm Ethan Foster, and in the next |
| 0:28.4 | few minutes, we'll explore how optimizing your vitamin D can dramatically lower your chance of |
| 0:33.4 | colon cancer. I'm Alara Sky, and this conversation matters because colorectal cancer claims nearly 930,000 |
| 0:40.3 | lives each year. |
| 0:42.3 | Worldwide, 1.2 million new cases emerge annually, making it the second most common cancer |
| 0:48.8 | in men and the third in women. |
| 0:50.8 | The latest review of more than 1.3 million participants shows a clear pattern. |
| 0:55.0 | Higher vitamin D, lower cancer risk, up to 58% in women. We'll walk you through the evidence |
| 1:01.2 | and the practical steps you can take today. First, size matters. This review pulled data from |
| 1:06.6 | 50 studies covering more than 1.3 million people across the United States, Canada, Denmark, |
| 1:13.3 | and beyond. Despite their differences, the same result emerged. Low vitamin D equals higher |
| 1:19.2 | colorectal cancer rates. But remember, colorectal cancer often develops silently with vague signs |
| 1:25.5 | such as abdominal discomfort, blood in your stool, fatigue, |
| 1:30.3 | or unexplained weight loss, signals many people overlook until the disease has advanced. |
| 1:35.3 | Ilarra, break down those numbers. Participants with the highest vitamin D intake or blood levels |
| 1:41.3 | consistently showed far fewer colorectal cancers. Women in the landmark |
| 1:45.6 | 1996 nurses' health study, who consumed the most vitamin D faced a 58% lower risk than those |
| 1:52.2 | consuming the least. A 2021 meta-analysis added that higher blood levels brought a 39% reduction, |
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