Does colloidal silver work, and is it safe?

Written by AI from saved sources. A script checks every quote word for word, and a second AI compares each claim with its source. How we work and corrections

Drinking colloidal silver has no established health benefit in these sources and can cause lasting harm. Colloidal silver consists of tiny silver particles in liquid. Laboratory and animal findings and specific medical uses do not establish a benefit from swallowing it.

Colloidal silver has shown anti-biofilm effects—effects against communities of bacteria in a protective matrix—in laboratory studies and an animal model of sinus inflammation. Silver nanoparticles, or tiny silver particles, have specific topical medical uses: treatments on body surfaces.

Why people believe it

Colloidal silver was used for infections and wounds before antibiotics. It consists of tiny silver particles in liquid. Natural Immunogenics markets Sovereign Silver for immune support, claiming safety and effectiveness.

A Finnish study examined three seller websites and two selected Facebook groups. This was not a sample that represented users as a whole. They found distrust of health authorities on the seller websites. They also found seller messages presenting natural remedies as better than synthetic drugs while making health risks seem less serious. They suggest information from trusted peers with shared experiences can seem more credible than authorities’ information, helping misleading recommendations spread. That is an interpretation, not a measured explanation for every user.

“It supports your immune system”

The manufacturer’s promise is a marketing claim. NCCIH says silver taken by mouth has no known function or benefit in the body. It is not an essential mineral—a mineral the body needs.

“It clears sinus infections”

A 2017 nasal-spray trial enrolled 22 people. Of these, 20 completed it. The participants had long-lasting sinus inflammation that resisted treatment, without nasal polyps. The Sovereign Silver spray contained 10 parts per million (a measure of silver content). Six weeks of this spray produced no meaningful improvement in symptoms or examination findings compared with salt-water spray. This was a small pilot study.

“It prevents COVID-19”

A 2021 study examined hospital staff in Tijuana. They reported infections with SARS-CoV-2, the virus that causes COVID-19. These occurred in 2 of 114 participants in the silver group versus 33 of 117 controls (comparison participants). The study ran over nine weeks in April–June 2020. It compared a silver-nanoparticle mouthwash and nasal-rinse or mouth-spray routine with conventional mouthwash and nasal rinsing. It did not test drinking silver. The groups differed in age and flu-vaccination history at the start. This limits what the results can tell us. This positive result conflicts with NCCIH’s position below. These sources do not settle that disagreement.

“It helps wounds heal”

A Cochrane review looked at silver dressings or surface treatments for wounds that were uninfected at the start. It found insufficient evidence that these treatments improve healing or prevent infection. Small, poor-quality studies suggested silver sulphadiazine, a silver medicine, slowed healing in burns affecting part of the skin’s thickness.

“Human testing shows it’s safe”

An oral-exposure study tested silver nanoparticle solutions taken by mouth in 60 healthy volunteers for up to 14 days. It tested 10- and 32-parts-per-million solutions. It found no clinically important changes (changes that matter to health) in the measures assessed. These were metabolic (body chemistry), blood-count and urine measures. A later review stresses that the limited doses and study length leave uncertain which doses cause harm. How silver nanoparticles build up in humans over the long term remains poorly understood. That cannot establish safety with prolonged use.

A 2013 case report described two cases of argyria after drinking silver solution. Argyria means silver builds up in tissues and turns skin blue-grey, usually permanently.

Official positions, with dates

FDA, effective 16 September 1999: its rule covered non-prescription drugs containing colloidal silver or silver salts, for internal or external use. It classified them as not generally recognised as safe and effective, and as misbranded. The rule covered drug uses, not every silver product.

NCCIH, April 2023: its summary says no clinical evidence (evidence from human studies) supports colloidal silver to prevent or treat COVID-19. NCCIH also discusses colloidal silver and other complementary products or practices not proven safe and effective. NCCIH says these should never delay seeing a healthcare provider about a medical problem.

What people also ask

What are the benefits of silver to the human body?

NCCIH identifies no known benefit from taking silver by mouth.

Does colloidal silver fight bacteria?

Promising laboratory and animal findings were followed by a human sinus trial. In treatment-resistant chronic sinus inflammation without nasal polyps, six weeks of 10-parts-per-million Sovereign Silver spray produced no meaningful symptom or examination improvement compared with saline.

Does colloidal silver help heal wounds?

The Cochrane review above could not establish a healing benefit for silver treatments on wounds uninfected at the start.

What are the negative health effects of silver?

Besides argyria, colloidal silver can reduce how much of certain antibiotics and thyroxine, a thyroid medicine, the body absorbs. NCCIH reports some evidence of kidney, liver or nervous-system problems. This is a more cautious finding.

Is colloidal silver good for sinus drainage?

The small 2017 nasal-spray trial involved long-lasting sinus disease that resisted treatment, without nasal polyps. Six weeks of 10-parts-per-million Sovereign Silver spray gave no meaningful improvement compared with saline (salt water).

Before you forward this: does the box at the top say exactly what the sources below say?