Colloidal silver is a liquid containing tiny silver particles suspended in water. Historically, it was used to treat wounds, infections, and skin conditions, and it still enjoys popularity today despite ongoing controversies.

The U.S. Food and Drug Administration (FDA) has never approved colloidal silver for medical use. In 1999, the FDA even sued several manufacturers for making false health claims about the product. Today, many companies sell it as a dietary supplement or homeopathic remedy—categories that avoid strict FDA regulation.

Supporters argue that colloidal silver possesses antibacterial, antiviral, and anti-inflammatory properties. Researcher Dr. Larry C. Ford documented that small amounts of silver can destroy over 650 types of pathogens and noted that silver doesn’t promote antibiotic resistance.

Some studies suggest that silver helps wounds heal faster and reduces infections, particularly when used in creams and dressings. It has also been applied in treating bacterial pink eye and was once a standard treatment for newborn eye care.

Additionally, colloidal silver may reduce inflammation. A study by the National Institutes of Health (NIH) found that inflamed pig skin treated with silver healed significantly faster. Some human studies show similar results, although more research is necessary.

Colloidal silver has also been explored as a treatment for sinus infections and the common cold. A 2011 study involving 100 children found those treated with silver and beta-glucan recovered more fully than those given saline.

Some users apply silver drops directly to the ear to ease ear infections. However, improper use carries risks, the most notable being argyria—a rare but permanent condition that causes the skin to turn blue-gray.

While high-quality silver hydrosol products may offer potential benefits, caution is crucial. Understanding the risks and avoiding misuse is essential before using colloidal silver for any health purpose.