Also known as: Silver nanoparticles, Nano silver
Colloidal silver is a suspension of silver particles in liquid marketed as an alternative health product. The FDA has stated that colloidal silver is not generally recognized as safe or effective for treating any disease or condition, and its use can cause permanent side effects including argyria.
Colloidal silver consists of tiny silver particles suspended in a liquid base, historically used as an antimicrobial agent before the advent of modern antibiotics. Despite widespread marketing claims, the U.S. FDA issued a final ruling in 1999 that over-the-counter products containing colloidal silver are not generally recognized as safe and effective and are misbranded. There is no high-quality clinical evidence supporting oral colloidal silver for immune support or any medical condition in humans. Silver does possess antimicrobial properties in topical wound care (e.g., silver sulfadiazine), but this does not extend to oral supplementation. Chronic oral ingestion can lead to argyria, an irreversible bluish-gray discoloration of the skin, and may interfere with the absorption of certain medications including antibiotics and thyroid drugs. Consumers should be aware that colloidal silver products vary widely in particle size and concentration, and no standardized dosing exists.
Silver compounds such as silver sulfadiazine are used in topical wound care for their broad-spectrum antimicrobial properties. This evidence does not support oral supplementation with colloidal silver.
Laboratory studies show silver nanoparticles can inhibit bacterial growth in vitro, but these findings have not been replicated in clinical human trials for oral use.
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The FDA warns that colloidal silver is not safe or effective for treating any condition. No legal health claims may be made. Chronic use causes irreversible argyria.
Not recommended — marketed form for oral use
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