High-dose folic acid appears safe from formaldehyde toxicity, according to a new Cornell University study on mice and human cancer patients who consumed high doses. This finding is particularly reassuring for patients who need higher levels of folic acid supplementation, especially those with Fanconi anemia, a rare cancer syndrome caused by a deficiency in a DNA repair pathway against toxins like formaldehyde. While previous studies have shown that tetrahydrofolate naturally decomposes to release formaldehyde, a carcinogen and genotoxin known to damage DNA, this new study provides evidence that this process does not occur in the body when consuming high doses of folic acid. The research, published in the journal EMBO Molecular Medicine, was conducted in partnership with the Cayuga Cancer Center and examined blood samples from local cancer patients prescribed high-dose folic acid supplementation. The study found that while folate levels increased in the blood of patients taking high doses of folic acid, formaldehyde-DNA adducts did not, indicating that formaldehyde is not increased as a toxic side effect. This is a significant finding, as formaldehyde is known to damage DNA and is a concern for cancer patients. The study's senior author, Dr. Meng Wang, an assistant professor in the Division of Nutritional Sciences, emphasized the importance of the study's human data, which confirmed that the results also translate into the human population. This research provides valuable reassurance for patients who require higher levels of folic acid supplementation, particularly those with Fanconi anemia, and highlights the safety of high-dose folic acid consumption. However, it is essential to note that further research is needed to fully understand the long-term effects of high-dose folic acid supplementation on human health.
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