Can Vitamin D Shrink Fibroid Tumors?

A new study published online in the journal Biology of Reproduction concluded that treatment with vitamin D reduced the size of fibroids in laboratory rats predisposed to the benign tumor.

Vitamin D was tested on a strain of rats genetically predisposed to developing fibroids. Twelve rats with fibroids were divided into two groups. One group received vitamin D and the other did not. In the study group vitamin D was  delivered continuously for three weeks  through a small pump planted under the skin.  The amount of vitamin D received each day was equivalent to a human dose of about 1,400 international units. This dose is more than the recommended dose for teens and adults age 70 and under of 600 units daily but under the dose of 4,000 units that is considered safe for children over age 9, adults, and for pregnant and breastfeeding women.

After three weeks both the study and control groups were  studied. Fibroids in the untreated group (controls) increased in size whereas the fibroids in the study group given vitamin D had shrunk dramatically. The uterine fibroids of the treated group receiving vitamin D were on average, 75 percent smaller than in the control group. The researchers concluded “Additional research is needed to confirm vitamin D as a potential treatment for women with uterine fibroids.”

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