New clinical evidence suggests that a widely used supplement may influence gut microbes involved in vitamin D metabolism and colorectal cancer pathways. In a precision-focused trial at Vanderbilt University Medical Center, researchers found that magnesium supplementation increased levels of certain gut bacteria known to produce vitamin D and help limit colorectal cancer development. The effect was observed primarily in women, possibly due to estrogen’s role in regulating magnesium uptake from the bloodstream into cells.

Figure 1. Magnesium Boosts Local Gut Vitamin D

Genetics Influence Who Gains the Most

To identify who benefits most, the researchers analyzed gut microbiome data and colonoscopy results from participants grouped by TRPM7 genotype, a gene crucial for magnesium and calcium absorption. Previous findings from the same randomized trial showed that magnesium supplementation increases vitamin D production and circulating levels. The new results reveal that magnesium also stimulates vitamin D production directly in the gut, where it acts locally rather than entering the bloodstream. These findings from the Personalized Prevention of Colorectal Cancer Trial were recently published in The American Journal of Clinical Nutrition. Figure 1 shows Magnesium Boosts Local Gut Vitamin D.

Gut Microbes Connect Magnesium to Colorectal Cancer Risk

“Our previous study showed that magnesium supplementation increased blood vitamin D levels when baseline levels were low,” said Qi Dai, MD, PhD, professor of Medicine. “The current study demonstrates that magnesium also boosts gut microbes capable of synthesizing vitamin D without sunlight, locally inhibiting colorectal cancer development.”

In the trial, participants were divided into a magnesium supplement group and a placebo group, with gut microbiomes analyzed from stool, rectal swabs, and rectal tissue. Among participants with adequate TRPM7 function, magnesium increased Carnobacterium maltaromaticum and Faecalibacterium prausnitzii, which synergistically promote vitamin D production and reduce colorectal carcinogenesis. In participants with inadequate TRPM7 function, magnesium reduced F. prausnitzii abundance in rectal mucosa.

Among 236 participants with a history of colorectal polyps, 124 underwent colonoscopies after a median follow-up of 3.5 years [1]. Higher levels of F. prausnitzii in rectal mucosa were linked to an almost threefold increase in the development of additional polyps. These results suggest that magnesium supplementation may lower colorectal cancer risk in individuals with suboptimal TRPM7 function. Overall, the study provides new insights into how nutrition and the gut microbiome interact in colorectal carcinogenesis, laying the groundwork for precision-based prevention strategies in high-risk populations.

References:

1. https://scitechdaily.com/this-popular-supplement-may-help-inhibit-colorectal-cancer-development/

Cite this article:

Janani R (2025), Popular Supplement Shows Potential to Inhibit Colorectal Cancer, AnaTechMaz, pp. 643