Some researchers suggest that aluminum-based antiperspirants and deodorants, applied regularly on the skin near the breast, may be absorbed by the skin, causing a hormonal effect resembling estrogen. Estrogen has the ability to promote breast cancer growth. Some research then suggests that the aluminum deodorants and antiperspirants may contribute to breast cancer.
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The National Cancer Institute (NCI), a part of the National Institutes of Health, have made no claims linking the use of antiperspirants or deodorants and breast cancer.
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Some studies show a link between aluminum and breast cancer, Alzheimer’s, and lymphatic or kidney disorders.