Perhaps at no other time in our nation’s history have people been more concerned about their immune systems. Maintaining what describes as a “vast network of cells and tissues” that is “necessary for our survival” requires adequate nutrition, rest and, sometimes, supplements.

One supplement lauded widely is colloidal silver, a solution consisting of small silver particles suspended in liquid. In 1999 the Food and Drug Administration ruled that products containing colloidal silver could not claim to be safe or effective, but according to’s March 2019 report, silver is antimicrobial, meaning it can kill harmful microbes when used in bandages, for example; yet, there is no evidence colloidal silver kills microbes internally.

However, colloidal silver is considered by users to be an effective homeopathic remedy to stimulate a weakened immune system.

Marissa Finnerty, a student with the Southwestern Community College Park Ranger Law Enforcement Academy in Western North Carolina, decided to ingest a daily dose of colloidal silver during the four-month, physically strenuous program because she knew she would be exposed to mountainous elements of cold, rain, snow and ice.

“I only take the product’s [Sovereign Silver] recommended one teaspoon daily, under my tongue, to maintain a healthy immune system,” said Finnerty in March.

“I’m a big fan because I’ve been able to keep colds at bay, and because it’s odorless, tasteless and not that expensive.”

While Finnerty has had no adverse reaction, too much colloidal silver can cause “serious side effects,” warned National Center for Complimentary and Integrative Health: “The most common is argyria, a bluish-gray discoloration of the skin, which is usually permanent.”

How much is too much varies with age, weight and health status. The concentration of silver particles varies among brands. Pointed out in September, an Environmental Protection Agency-created dosing reference chart shows an individual’s daily silver exposure should not exceed 5 micrograms per every kilogram of body weight.

Cleveland Clinic’s stance is that nutritious foods do a better job than supplements to boost the immune system. Specifically recommended are foods rich in vitamins C, E and A, folic acid, selenium, iron and zinc.

And if looking for coronavirus protection, “colloidal silver isn’t considered safe or effective for any of the health claims manufacturers make,” says the Mayo Clinic.

In fact, “colloidal silver products may also interact with medications, including penicillamine (Cuprimine, Depen), quinolone antibiotics, tetracycline and thyroxine (Unithroid, Levoxyl, Synthroid) medications,” says Mayo.