Kate Beckinsale's Manicurist Tells Everyone to Buy This $9 Nail Growth Product

Tiny as they are, our nails are a mirror of our health at large. Indeed, fast-growing, strong, unbreakable nails can often be a sign that we're meeting our general nutritional requirements. Plus, it's just plain nice to have nails that grow quickly and don't break every two seconds. Brittle, soft, and thin nails affect an alarming percentage of us, though. One in five people has weak nails, studies show. Causes include a wide range of conditions, from psoriasis to hyperthyroidism to anemia, so if you have super-weak nails (maybe that are always peeling or even become detached from the nail bed), definitely consult your dermatologist to see what might be up.