New Study Shows Vitamin D May Reduce Colon Cancer Risk By 58%

Colon cancer rates are increasing at alarming rates—especially among younger adults. While this cancer is still considered an age-related disease, environmental and lifestyle factors can spur or hasten the progression. Data indicate that around 50% of colon cancer cases1 can be prevented through lifestyle modifications. 

One key area to focus on is your vitamin D status. Decades of data indicate that vitamin D may be protective against colorectal cancers, whereas low levels of the vitamin are a risk factor. 

In order to get a complete picture of this complex relationship, researchers recently reviewed data from 50 studies and over 1.3 million participants to reveal the role of vitamin D in colorectal cancer prevention2. Here's what you need to know. 

Vitamin D status & intake likely reduce colorectal cancer risk

The researchers found that low vitamin D levels are strongly linked to a higher risk of developing colorectal cancer. 

Among the 50 studies researchers thoroughly reviewed, these are the general findings from the most notable ones: 

How does vitamin D protect against cancer?

While many studies highlighted in this review showed protective benefits of vitamin D, most were not able to pinpoint the exact mechanisms through which these benefits occurred. 

However, lab, animal, and other human studies indicate that the active form of vitamin D in your body (calcitriol) may target colon cancer progression in a variety of ways2: 

Most people have low vitamin D levels

So yes, vitamin D can be protective against colorectal cancer in addition to aiding everything from immunity to mood and cellular aging.

But most people have very low levels of the vitamin. A 2025 study that looked at the impact of vitamin D levels and muscle mass of over 5,600 U.S. adults found that: 

That's right: Nearly 80% of folks had low vitamin D levels. 

Researchers of this review emphasized the importance of having your vitamin D levels in the 30–40 ng/mL, and many people would benefit from having vitamin D status of 50 ng/mL. So, how do you get there? 

Increasing your vitamin D levels

However, many people (especially those with low vitamin D levels) would benefit from a high-quality vitamin D supplement.

A good rule of thumb is to look for supplements that provide 2,000-5,000 IU of vitamin D3 (not D2) and take it daily. You should start to see your vitamin D levels start to improve within a few months. 

The takeaway

Vitamin D status is just one lifestyle factor connected to your colorectal cancer risk—and one that's pretty easy to improve with supplementation. You can further reduce your risk by incorporating these six other lifestyle habits into your routine. 

And remember, regular screenings (starting at age 45) are essential for early detection and treatment of any concerning findings.