Himalayan Salt Square Cube Shaped Salt Lamp What Are Himalayan Salt Lamps? Himalayan salt lamps are crystals carved from amber-colored rock salt, hollowed out to fit a lightbulb inside. When you light them, they give out a warm, reddish-pink glow. Sellers of these decorative pieces say they do more than light up a room. They claim the lamps can boost mood, improve sleep, ease allergies, help people with asthma breathe better, and clean the air, among other benefits. The claims sound impressive. Yet the scientific evidence to back them up is scarce. The salt in these lamps comes from the Himalayas, a mountain range that stretches about 1,500 miles across Pakistan, India, Bhutan, and Nepal. True Himalayan salt lamps come from the Khewra Salt Mine in Pakistan. The salt this mine produces has a reddish, pink, or off-white color. There are plenty of fake ones sold online. The real versions are fragile and give off a dim light. The phony products are tough to break and glow brightly. How Do Himalayan Salt Lamps Work? Advocates say the lamps work in two ways: Pull in particles: These lamps supposedly attract allergens, toxins, and pollutants to their surface. Possibly release negative ions: Some people believe negative ions in the air have health benefits. Ions are molecules that have undergone a change in charge. Negative ions have gained an electron. Positive ions have lost one. Ions are all around us. Some come from particles from outer space that make their way to Earth. Others form closer to home, from radiation, sunlight, lightning, or the collision of water droplets in a waterfall. Some people say they feel more refreshed and clear-headed after a storm, a feeling they believe is due to the number of negative ions in the air. Commercial ionizers and purification systems also produce negatively charged ions to create cleaner and more comfortable indoor spaces. Himalayan salt lamps supposedly produce negatively charged ions while water molecules from the air attract to -- and then evaporate from -- the warmth of its surface. Those who believe in the health benefits of these lamps give negative ions much of the credit.