Cobalt is used in rechargeable lithium‑ion battery cathodes, high‑strength superalloys for jet engines and gas turbines, hard magnets, and catalysts in chemical processes. It forms pigments for glass and ceramics, serves in electroplating and drying agents for paints, and its radioactive isotope cobalt‑60 is used in radiotherapy and sterilization. Biologically, cobalt is an essential component of vitamin B12.

Yes. Vitamin B12 (cobalamin) contains a central cobalt atom bound within its corrin ring; this cobalt is essential for the vitamin’s biochemical activity. B12’s cobalt-dependent forms are required for red blood cell production, neurological function, and DNA synthesis. Dietary B12 supplies the body’s cobalt needs; isolated cobalt salts are different and can be harmful if misused.

CO (all caps) is not an element but the molecular formula for carbon monoxide, a colorless, odorless, toxic gas made of one carbon and one oxygen atom. The element with symbol Co (capital C, lowercase o) is cobalt, atomic number 27, a hard, silvery-blue transition metal used in alloys, batteries, and vitamin B12. Cobalt is ferromagnetic and found in ore deposits.

Cobalt metal is a hard, lustrous, silver-gray metal with a distinct bluish tint. In bulk it appears silvery-gray or silver-white, while finely divided cobalt or its compounds emphasize a more vivid blue. The metallic surface is shiny and may tarnish slightly in air, but cobalt’s characteristic appearance is a silvery metal with a subtle blue cast.

Cobalt is an essential trace element (part of vitamin B12) but can be harmful at high exposures. Occupational inhalation, contaminated supplements, metal-on-metal implants, or industrial contact can cause lung irritation, skin allergy, heart problems (cardiomyopathy), thyroid and neurological issues, and blood changes. Normal dietary levels are safe; toxicity is linked to excessive exposure or high‑dose supplements.

The Democratic Republic of the Congo produces the most cobalt worldwide. Its mines supply roughly 60–70% (commonly cited around 70%) of global cobalt mine production, driven by large industrial and artisanal operations in the country’s copper‑cobalt belt. This dominant share makes the DRC the primary source of cobalt used in batteries and other industrial applications.