Dull Hair If no amount of shine spray is giving you the sheen you crave, it's time to get to the root of the matter (pun intended). Dull hair can be associated with iron deficiency and dehydration, points out New York City dermatologist Rosemarie Ingleton, MD, medical director of Ingleton Dermatology. Sometimes something as simple as a healthier diet can make a difference — especially if your diet isn't the healthiest to begin with — like eating more iron-rich foods, such as black beans and spinach. Make a conscious effort to drink those eight glasses of H2O daily too and see if you notice a change in your strands.
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