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Colloidal Silver



How much do we know about colloidal silver?

There are no high quality studies on the health effects of taking colloidal silver, but we do have good evidence of its dangers.

What do we know about the effectiveness of colloidal silver?

Claims made about the health benefits of taking colloidal silver aren’t backed up by studies.

What do we know about the safety of colloidal silver?

The U.S. Food and Drug Administration (FDA) has said that colloidal silver isn’t safe or effective for treating any disease or condition.

What Is Colloidal Silver?

Colloidal silver consists of tiny silver particles in a liquid.

It’s sometimes promoted on the Internet as a dietary supplement, but evidence supporting health-related claims is lacking.

It can be dangerous to your health.

 

What the Science Says About the Safety and Side Effects of Colloidal Silver

Colloidal silver can cause serious side effects. The most common is argyria, a bluish-gray discoloration of the skin, which is usually permanent.

Colloidal silver can also cause poor absorption of some drugs, such as certain antibiotics and thyroxine (used to treat thyroid deficiency).

The FDA also warned in 1999 that colloidal silver isn’t safe or effective for treating any disease or condition.

The FDA and the Federal Trade Commission have taken action against a number of companies for making misleading claims about colloidal silver products.

More About Argyria

Silver can build up in the body’s tissue, causing a bluish-gray discoloration of large areas of skin, especially those exposed to the sun.

People have developed argyria from using homemade and commercial colloidal silver products.

What the Science Says About the Effectiveness of Colloidal Silver

Scientific evidence doesn’t support the use of colloidal silver dietary supplements for any disease or condition.

Silver has no known function or benefits in the body when taken by mouth.

Silver is not a nutritionally essential mineral or a useful dietary supplement.

People may be exposed to silver, usually in tiny amounts, through air, water, and food, and in certain activities such as jewelry-making or soldering.

Colloidal silver products are sometimes sold as homeopathic remedies. For more information on homeopathy, see nccih.nih.gov/health/homeopathy.

Topical silver (used on the skin) has some appropriate medical uses, such as in bandages and dressings to treat burns, skin wounds, or skin infections. It’s also in medicines to prevent conjunctivitis (an eye condition) in newborns. However, there are no legally marketed prescription or over-the-counter drugs containing colloidal silver that are taken by mouth.

More to Consider

Colloidal silver and other complementary products or practices that have not been proven safe and effective should never be used to replace conventional medical care or as a reason to postpone seeing a health care provider about a medical problem.

Tell all your health care providers about any complementary health approaches you use. Give them a full picture of what you do to manage your health. This will help ensure coordinated and safe care.

Key References

  • Agency for Toxic Substances and Disease Registry. ToxFAQs for Silver. Agency for Toxic Substances and Disease Registry Web site. Accessed at www.atsdr.cdc.gov/toxfaqs/tf.asp?id=538&tid=97 on January 18, 2012.
  • Chung IS, Lee MY, Shin DH, et al. Three systemic argyria cases after ingestion of colloidal silver solution. International Journal of Dermatology. 2010;49(10):1175–1177.
  • Consumer advisory: dietary supplements containing silver may cause permanent discoloration of skin and mucous membranes (argyria). U.S. Food and Drug Administration Web site. Accessed at www.fda.gov/food/recallsoutbreaksemergencies/safetyalertsadvisories/ucm184087.htm on May 20, 2014.
  • Han TY, Chang HS, Lee HK, et al. Successful treatment of argyria using a low-fluence Q-switched 1064-nm Nd:YAG laser. International Journal of Dermatology. 2011;50(6):751–753.
  • U.S. Food and Drug Administration. Rules and regulations: over-the-counter drug products containing colloidal silver ingredients or silver salts. Final rule. Federal Register. 1999;64(158):44653–44658.

-NIH



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