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Is your part looking a little wide? Hair feeling thin? First, the good news: Finding the best hair-growth serum, available over-the-counter and in your local beauty aisle, can wave a thickening wand over your hair, making your strands fuller, denser, and more ripe for flipping or fluffing after a few months. But alas, the serums aren’t a cure-all for hair loss. “If one has active hair loss it is important to see a board-certified dermatologist, as there can be underlying issues or a hormonal component at the root of it,” says Margarita Lolis, MD, a board-certified dermatologist and Mohs surgeon based in New Jersey. “With that said, if you just want to promote hair growth and thickness then there are many hair-growth serums available.”