Faster and lighter are the qualities many of us look for in a car, a laptop, and our bodies when we're running a marathon. They're also the prized attributes of skin care serums -- light, fast-absorbing liquids used as an alternative or in addition to creams or lotions.
The biggest difference between a serum and a cream or lotion is what the formulation doesn't include. Serums leave out occlusive, or airtight, moisturizing ingredients such as petrolatum or mineral oil that keep water from evaporating. They also contain fewer lubricating and thickening agents, like nut or seed oils. Most serums are water-based, eliminating oils altogether.
Serum Benefits
Because active ingredients are more expensive than thickeners, serums are also the costliest product in many skin care lines. But when applied properly, a 1-ounce container of serum should last months. Many brands come in pump bottles or have medicine-dropper applicators to dispense just the tiny amount you need.
Those few concentrated drops are super-efficient. Serums are made of very small molecules, so the skin absorbs them quickly and deeply. The thicker, heavier ingredients in creams form a barrier on your skin. That's great for locking moisture in. But it can also lock active ingredients out. Without these hindrances, the active ingredients in a serum penetrate your skin faster and more effectively.
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