Cadmium is a soft, silvery-white metal that shows up in more places than most people realize, from solar panels on rooftops to the bright colors on drinking glasses. While its use in consumer products has been shrinking due to toxicity concerns, cadmium still plays important roles in energy production, industrial manufacturing, and even the food you eat.
Rechargeable Batteries
For decades, nickel-cadmium (NiCd) batteries were the go-to rechargeable option for cordless power tools, camera flash units, remote-controlled cars, emergency lighting, and portable electronics. Their big advantage was the ability to deliver high bursts of current, which made them ideal for anything that needed a quick surge of power.
That era is largely over. Lithium-ion and nickel-metal hydride batteries now outperform NiCd in capacity and cost, and regulations have accelerated the shift. The European Union banned the sale of most consumer NiCd batteries starting in 2006, with portable power tools losing their exemption in 2016. Medical devices, alarm systems, and emergency lighting are among the few categories still permitted. You’ll still find NiCd cells in some solar garden lights, hobby electronics, and older cordless phones, but they’re increasingly a legacy technology.
Solar Panels
This is where cadmium’s role is actually growing. Cadmium telluride (CdTe) solar panels held about 34% of the U.S. utility-scale solar market in 2022, making them the leading alternative to traditional silicon panels. You’ve likely driven past large solar farms using this technology without knowing it.
CdTe panels have some real manufacturing advantages. They require roughly 35% of the energy to produce compared to a silicon panel of the same power rating, which means they “pay back” the energy used to make them about four months sooner. They also perform well in hot climates, losing less efficiency as temperatures rise. The streamlined production process requires less capital to scale up, which is one reason a single U.S. manufacturer, First Solar, has built its entire business around the technology.
Pigments and Colorants
Cadmium sulfide and cadmium sulfoselenide produce vivid yellows, oranges, and reds that are remarkably stable under heat and light. These pigments have been used in paints, plastics, ceramics, and glass for over a century. Artists still prize cadmium-based oil paints for their intensity and permanence.
In consumer products, the most common encounter is decorated glassware. Brightly colored enamel on drinking glasses can contain cadmium pigments, and research has identified this as the greatest consumer exposure risk from cadmium pigments. Ceramic products also use cadmium-based glazes, though the pigment is typically encapsulated and overglazed to limit contact. Colored plastics, especially those requiring heat stability during manufacturing, have historically used cadmium pigments as well, though substitutes have reduced this practice significantly.
PVC Stabilizers
Polyvinyl chloride, the plastic used in window frames, pipes, siding, and vinyl flooring, degrades when exposed to heat and sunlight. Cadmium compounds have been used as stabilizers to prevent this breakdown, particularly in rigid PVC intended for outdoor use. At one point, roughly 15% of the world’s cadmium production went into PVC stabilizers. Regulatory pressure in Europe and North America has pushed manufacturers toward zinc-based and calcium-based alternatives, but cadmium-stabilized PVC remains in older buildings and in some markets with less restrictive regulations.
Anti-Corrosion Coatings
Cadmium plating creates a thin protective layer on metal parts that resists salt corrosion exceptionally well. This makes it valuable for connectors, fasteners, and hardware in aerospace and military applications, particularly anything exposed to marine environments. NASA, the U.S. military, and aviation manufacturers have all used cadmium-plated components extensively, though even these industries are working to find substitutes due to the metal’s toxicity. If you’ve handled military-spec bolts or certain aircraft connectors, you’ve touched cadmium plating.
How Cadmium Reaches You Through Food and Tobacco
Beyond manufactured products, cadmium enters everyday life through diet and smoking. The metal occurs naturally in soil and accumulates in certain foods. The biggest dietary sources are rice and grains, shellfish and seafood, organ meats, and leafy vegetables. Plants absorb cadmium from the ground, and it concentrates as it moves up the food chain.
Tobacco is a particularly efficient cadmium accumulator. The average cigarette contains about 2 micrograms of cadmium, and each one delivers roughly 0.1 to 0.2 micrograms directly into the lungs. Over years of smoking, this adds up. Smokers consistently carry higher cadmium levels in their blood and kidneys than nonsmokers.
The World Health Organization sets a tolerable weekly intake of 7 micrograms per kilogram of body weight. For a 150-pound person, that works out to about 476 micrograms per week. Most people in developed countries stay well under that threshold through food alone, though populations in areas with contaminated soil or heavy rice consumption can exceed it.
Why Cadmium Use Keeps Shrinking
Cadmium accumulates in the body over decades, concentrating primarily in the kidneys. Over time, it damages kidney function by interfering with the organ’s ability to filter and reabsorb essential minerals. Calcium and phosphorus get flushed out instead of retained, and the kidneys produce less active vitamin D, which further reduces calcium absorption in the gut. The result is weakened bones, a secondary effect that follows the kidney damage. Some laboratory studies suggest cadmium may also directly interfere with bone-building and bone-breakdown cells, compounding the problem.
These health risks are the driving force behind tightening regulations worldwide. The EU’s battery directive, restrictions on cadmium in PVC, and limits on cadmium in consumer products all reflect a steady push to phase out the metal wherever safer alternatives exist. In 2024, the U.S. Consumer Product Safety Commission recalled children’s ring sets sold on Amazon because they contained cadmium at levels prohibited in children’s products, a reminder that enforcement remains an active concern, especially with low-cost imported goods.
Cadmium hasn’t disappeared from daily life, but its footprint is shifting. It’s moving out of batteries, toys, and plastics and concentrating in areas where its properties are hardest to replace: solar energy, specialty coatings, and artist-grade pigments.