Evidence supporting the use of: Iodine
For the body system: Breasts

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Synopsis

Source of validity: Scientific
Rating (out of 5): 4

Iodine plays a crucial role in breast health, supported by scientific evidence. Iodine is an essential trace element necessary for the synthesis of thyroid hormones, but it is also highly concentrated in breast tissue, particularly during periods of development and lactation. Research indicates that iodine deficiency can lead to fibrocystic breast changes—a benign but sometimes painful condition characterized by lumpy, tender breasts. Some clinical studies, including randomized controlled trials, have shown that iodine supplementation can reduce symptoms of fibrocystic breast disease, including pain and nodularity. The proposed mechanism involves iodine’s role in maintaining normal epithelial architecture and mitigating the effects of estrogen on breast tissue. Epidemiological studies also observe that populations with higher iodine intake (such as Japanese women) have lower rates of certain benign breast conditions and, possibly, breast cancer, although direct causality regarding cancer prevention is not established. The scientific consensus supports iodine’s importance for breast tissue health, especially in populations at risk of deficiency. However, the evidence is strongest for its role in treating fibrocystic breast changes rather than for general breast health or cancer prevention. It is important to note that excessive iodine intake can have adverse effects, so supplementation should be approached with caution and ideally under medical supervision.

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