This one is something of a given, and will be addressed by the following strategies below, but the main takeaway is that if you want healthy, strong hair—just like a healthy, strong body—hydration is key. Don't do things that will dehydrate your scalp, such as smoke or drink heavily, go out in the sun without a hat or use chemical-heavy products that contain alcohol, which will ultimately sap your hair and scalp of necessary moisture. If you find that your scalp is flaking, sub in a dandruff shampoo once a week to rid yourself of dryness.

First, you want to dry it gently. A blow dryer can give your fine hair more volume, but use the warm (not hot) setting in order to dry but not torch the hair's natural proteins. And try ditching the comb. If you're too aggressive with combing and brushing, you run the risk of making thin hair look limp and it will fall flat against the scalp. To give the hair more natural texture and body, try styling it with your fingers, using whatever water-soluble product you like. But if you have really fine or thinning hair, you might want to experiment with a hair powder that adds a little camouflage while boosting volume at the root without weighing your hair down.

You want healthy hair? You got to treat it right. And that means showering before bed to rinse out the grime and pollution that's accumulated during the day along with any residual product that's left on your hair and scalp. This will allow your scalp to breathe and gives the hair a chance to rest after being washed. Speaking of washing, a quality thickening shampoo can deliver noticeable results. That's because most contain ingredients like proteins, amino acids and keratin that plump the strands and make them look thicker and fuller. Many also pull double duty by helping to strengthen your hair and make it more resilient, too. Then, come morning, you can simply rinse the hair with water before styling.

Hair is technically dead, but that doesn't mean the individual strands and the follicles from which they grow can't be made healthier. Hair masks work like supercharged leave-in conditioners. Apply them to just-washed hair and they'll juice up hair with extra hydration and a dose of nutrients. Hair serums and topical sprays utilize proven ingredients like finasteride, minoxidil and biotin to increase hair density and blood flow to the scalp, which allows the hair to be well nourished, resulting in the appearance of thicker hair. Finally, supplements can help by targeting the root causes of thinning, including hormones, stress and lifestyle.