A new review of research indicates that maintaining sufficient vitamin D levels may help lower a person’s risk of developing colorectal cancer.
The analysis, published in a scientific journal, examined data from 50 studies involving more than 1.3 million participants to clarify the role of vitamin D in preventing this type of cancer. The findings show a strong link between low vitamin D levels and a higher risk of colorectal cancer.
One major meta-analysis within the review found that people with higher blood levels of vitamin D had a 39% lower risk of colorectal cancer compared to those with lower levels. When levels were tracked over time, those with higher vitamin D had a 20% reduced risk.
A separate landmark study from 1996 found that women with the highest vitamin D intake were 58% less likely to develop colorectal cancer than those with the lowest intake. Other studies, including the Iowa Women’s Health Study, showed that women taking calcium and vitamin D supplements had a 15% lower risk.
Further research highlighted that increasing vitamin D intake reduced the risk of adenomas, which are polyps that can turn into cancer. A Canadian study found vitamin D supplements reduced the risk of polyps by 33% and high-risk polyps by 43%.
While the exact protective mechanisms are not fully defined by these population studies, laboratory and animal research suggests the active form of vitamin D in the body, calcitriol, may combat cancer progression in several ways. These include slowing cancer cell growth, triggering cell death, supporting a balanced gut microbiome, maintaining healthy intestinal cells, and reducing inflammation in the gut.
Despite the potential benefits, many people have low levels of vitamin D. A 2025 study of over 5,600 U.S. adults found that 42% were vitamin D deficient, and 37.6% had insufficient levels. This means nearly 80% of adults studied had low vitamin D.
Researchers involved in the review emphasize the importance of maintaining blood levels between 30 and 40 ng/mL, noting that some people would benefit from levels around 50 ng/mL.
Vitamin D is found naturally in some foods like cod liver oil, trout, and salmon, and is added to fortified foods like milk. However, for many people, especially those with low levels, a dietary supplement may be beneficial. A common recommendation is to look for supplements that provide 2,000 to 5,000 IU of vitamin D3, taken daily, with levels typically improving within a few months.
Vitamin D status is one of several lifestyle factors connected to colorectal cancer risk. Medical professionals also stress that regular screening for colorectal cancer, generally recommended starting at age 45, remains very important for early detection and treatment.
The review’s authors point to broader public health data indicating that approximately half of all colon cancer cases could potentially be prevented through various lifestyle modifications, with vitamin D intake being a notable area of focus given the widespread prevalence of deficiency.
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