Is it just us, or are supplements *everywhere* these days? There are magic pills to boost your brain power. You can find beauty-enhancing vitamins to make your skin glow, your hair grow, and your nails get strong. Or, if you’re feeling more high-tech, there’s even a fitness device that creates personalized health supplements based on your activity. But do we really need all of these boosters, or are we just paying for a quick infusion of hope? We checked with the pros to find out which vitamins and supplements are worth shelling out for — and when to save your money.