High levels of folic acid promote breast cancer in rats
Folic acid supplements, taken at the same level as by breast cancer patients and survivors in North America, promotes the growth of existing breast cancer in rats, according to a new study published in PLOS ONE.
Other studies have found that folic acid may prevent breast cancer, but recent research has shown that taking folic acid in high quantities may actually increase risk for developing breast cancer.
The study found that folic acid supplements in doses 2.5 to five times the daily requirement significantly promotes the growth of pre-cancerous and cancerous cells in the mammary glands of rats.
The researchers say this is concerning because patients and survivors of breast cancer are often exposed to high levels of folic acid through supplements and fortification in food.
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