Colloidal silver is a suspension of microscopic particles of silver, usually in water, that has gained an undeserved reputation as a cure-all with claims that it is a natural broad-spectrum antibiotic, antifungal, & antiviral agent, & as a nonspecific "immune system booster". There are also claims that it is able to treat serious diseases such as AIDS, Lyme, etc.β which are all groundless woo. Colloidal silver is used topically by applying with a dropper to the skin (for example, as an antiseptic on cuts), or taken internally. There is no empirical evidence that it is effective at all when taken internally for anything except making you look like a Smurf. The US CFR prohibits vendors from claiming any health benefit from colloidal silver or silver salt-based products. The medical consensus is that colloidal silver, despite being readily available as a "health supplement", is dangerous & provides no health benefits.
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https://rationalwiki.org/wiki/Colloidal_silver