Serums. Do you need them? What do they really do? They're usually in slim vials or small bottles with eye droppers attached. They can seem a bit dainty and frou-frou. But these powerful and formidable products are easy to add to your grooming arsenal. And you do want to use them. Here's why: like high-proof liquor, serums pack a ton of potency into every drop. For example, most facial lotions typically contain about 5 to 10 percent of active ingredients. By contrast, serums can pack up to 70 percent.

Plus, your daily lotion has larger molecules than a serum, so it typically won't penetrate the skin as far as a serum will. And while serums certainly provide your skin with additional moisture, the main reason a man would want to use one is to add nourishing ingredients into the deeper layers of the skin that a regular moisturizer isn't able to deliver. Which is why you apply them after you wash your face, but before you apply your daily lotion.

The best serums are designed to target specific concerns, from reducing wrinkles or fighting acne to adding brightness to a dull complexion. And you want to tackle these concerns. For men over 30, your body's natural skin-cell renewal process is slowing. For younger guys, a serum can ensure your skin stays in peak condition. Since they're lightweight and quick-absorbing, they're ideal for the warmer weather, when thicker creams can feel heavy and greasy. Herewith, five of the best serums for your most pressing skin concerns: