Vitamins and mineralsColloidal silver — natural antibiotic or dangerous myth?
- Henryk Różański — Borelioza – Borreliosis – fitoterapia cz. VII
- Henryk Różański — SARS-CoV-2 i COVID-19. Wolne przemyślenia.
- Henryk Różański — Ponury dzień
- Henryk Różański — Stara mieszanka znowu pomogła :-)
- Henryk Różański — Ziołomiody w praktyce
- Antibacterial Activity of Colloidal Silver against Gram-Negative and Gram-Positive Bacteria. · Antibiotics (Basel) 2020
- Colloidal silver against macrophage infections and biofilms of atypical mycobacteria. · Biometals 2023
- Colloidal silver combating pathogenic Pseudomonas aeruginosa and MRSA in chronic rhinosinusitis. · Colloids Surf B Biointerfaces 2021
- Silver in health care: antimicrobial effects and safety in use. · Curr Probl Dermatol 2006
- Microfluidics-based engineered silver nanoparticles to control growth and biofilm formation in bacterial pathogens causing dental infection. · Sci Rep 2026
- Green synthesis of silver nanoparticles under ambient conditions using onion, turmeric, and galangal extracts with antibacterial activity against E. coli and S. aureus. · Biotechnol Rep (Amst) 2026
- Green-synthesized silver nanoparticles from fresh and waste Posidonia oceanica extracts: characterization and evaluation of antibacterial, cytotoxic activity against HCT-116 cells, and ecotoxicological properties. · RSC Adv 2026
Henryk Różański claims that colloidal silver disrupts the functioning of disease-causing cells and destroys their membranes.
- He describes it as safe and says that current supplements have a placebo effect.
- He recommends taking a 1% silver solution by mouth—one teaspoon once a day.
- He claims that silver’s effect on bacteria does not apply to viruses.
- He describes using silver himself during a cold and says it helped ease his symptoms.
What the authors write
According to Henryk Różański, colloidal silver disrupts the functioning of disease-causing cells and destroys their membranes.
Henryk Różański claims that silver in current supplements has a placebo effect and describes colloidal silver as safe.
Henryk Różański recommends taking a 1% colloidal silver solution by mouth at a dose of one teaspoon once a day.
Henryk Różański claims that silver’s oligodynamic effect against bacteria does not apply to viruses.
Henryk Różański claims that store-bought silver products contain only trace amounts of silver, and that some contained silver derived from silver nitrate.
Henryk Różański describes using colloidal silver himself during a cold and says it helped ease his symptoms.
Henryk Różański claims that adding colloidal silver strengthens the antimicrobial effect of herbal honey.
Research from PubMed · Europe PMC
We selected 7 studies with the best, positive results. This is a selection, not a full review of all research.
Total number of studies on this topic in PubMed: 104.
In a laboratory study, colloidal silver inhibited the growth of many drug-resistant bacteria, but its effectiveness was assessed only in vitro.
Aim of the study: Due to the emergence of antimicrobial resistance, new alternative therapies are needed. Silver was used to treat bacterial infections since antiquity due to its known antimicrobial properties.
Results: CS MIC90 was 4-8 mg/L for all strains. CS was bactericidal, during 24 h, at 1× and 2× MIC against Gram-negative bacteria, and at 2× MIC against Gram-positive bacteria, and it did not affect their membrane permeabilization. Furthermore, we found that CS significantly increased the ROS production in Gram-negative with respect to Gram-positive bacteria at 24 h of incubation. Altogether, these results suggest that CS could be an effective treatment for infections caused by MDR Gram-negative and Gram-positive bacteria.
“Not stated” does not mean nobody paid — the database does not always record it.
In a laboratory study, green colloidal silver reduced M. abscessus infection in macrophages and showed no toxicity to the tested cells at low concentrations.
Aim of the study: Skin and soft tissue infection (SSTI) caused by atypical mycobacteria such as Mycobacterium abscessus and Mycobacterium avium intracellulare complex (MAIC) have increased in recent years. Current therapeutic options are limited, and hence new and better therapies are urgently required.
Results: The concentration of 3 ppm reduced M. abscessus-infection in macrophages significantly. GSCS was not cytotoxic to HaCaT and neonatal foreskin fibroblast cells at concentrations < 3 ppm up to 2 h exposure time. GSCS therefore, has the potential for topical application against atypical mycobacterial SSTI.
“Not stated” does not mean nobody paid — the database does not always record it.
In a laboratory study and a nematode model, colloidal silver acted against bacteria associated with chronic sinusitis, but this does not prove that it is effective in humans.
Aim of the study: The emergence of antibiotic resistant bacteria requires for the development of new antimicrobial compounds one of which colloidal silver (CS) having strong bactericidal properties and being the most promising inorganic nanoparticles for the treatment of bacterial infectious diseases. However, their production can be slow and cumbersome.
Results: aeruginosa, respectively. In conclusion, a novel, green synthesis of stable CS is demonstrated with good safety and efficacy profiles, particularly against P. aeruginosa in planktonic and biofilm forms. These CS have potential applications against clinical infections, including in the context of CRS.
“Not stated” does not mean nobody paid — the database does not always record it.
The review describes silver’s antimicrobial effects, but notes that long-term ingestion or inhalation of silver products, especially colloidal silver, can lead to silver buildup in the body.
Aim of the study: Silver has a long and intriguing history as an antibiotic in human health care. It has been developed for use in water purification, wound care, bone prostheses, reconstructive orthopaedic surgery, cardiac devices, catheters and surgical appliances.
Results: Silver is absorbed into the human body and enters the systemic circulation as a protein complex to be eliminated by the liver and kidneys. Silver metabolism is modulated by induction and binding to metallothioneins. This complex mitigates the cellular toxicity of silver and contributes to tissue repair. Silver allergy is a known contra-indication for using silver in medical devices or antibiotic textiles.
“Not stated” does not mean nobody paid — the database does not always record it.
In a laboratory study, silver nanoparticles inhibited the growth of bacteria associated with tooth infections and the formation of their biofilm.
Aim of the study: Dental infections caused by Streptococcus mutans and Enterococcus faecalis are major contributors to dental caries and root canal infections due to their strong biofilm forming ability across all age groups.
Results: mutans and E. faecalis. Mechanistic investigations revealed that the nanoparticles induced oxidative stress, characterized by increased lipid peroxidation (MDA), reduced antioxidant enzyme activities (CAT and SOD), and leakage of intracellular proteins and sugars, indicating membrane damage. Overall findings demonstrate that microfluidics-assisted green-synthesized CtAgNPs effectively inhibit the growth and biofilm formation of dental pathogens, highlighting their potential as an eco-friendly nanotherapeutic strategy for the prevention and management of dental biofilm-associated infections.
“Not stated” does not mean nobody paid — the database does not always record it.
Silver nanoparticles produced using plant extracts showed activity against E. coli and Staphylococcus aureus in a laboratory study.
Aim of the study: This study developed a sustainable method for synthesizing antibacterial silver nanoparticles (AgNPs) using aqueous extracts of onion, galangal, and turmeric as natural reducing and stabilizing agents under ambient conditions. The extracts showed antioxidant activity (32.52-59.89 %) and total phenolic contents of 2.26-4.03 mg GAE/g DW, enabling AgNP formation without hazardous chemicals or heating.
Results: All samples showed MIC/MBC of 50 µg/mL against S. aureus, whereas onion-derived AgNPs were most effective against E. coli (MIC 200; MBC 400 µg/mL). These plant extracts are promising low-cost bioresources for green nanomaterial production.
“Not stated” does not mean nobody paid — the database does not always record it.
Silver nanoparticles made from waste Posidonia oceanica leaves showed greater antibacterial activity than nanoparticles made from fresh leaves.
Aim of the study: Posidonia oceanica, an endemic Mediterranean seagrass, represents a valuable source of bioactive compounds and an abundant marine biomass waste. In this study, aqueous extracts from fresh (POV) and waste (POD) leaves of P.
Results: Acute cytotoxicity testing via Artemia salina showed moderate toxicity after 24 hours ranging from 63.3 ± 5.8% to 86.6 ± 5.8% for POV AgNPs and from 73.3 ± 5.8% to 86.6 ± 5.8% for POD AgNPs, indicating a lower toxicity profile for POD AgNPs. Importantly, these toxic effects were observed at concentrations substantially higher than those required for antibacterial and cytotoxic activities. Overall, P. oceanica-derived AgNPs represent sustainable marine-derived nanomaterials with promising antioxidant, antibacterial, and cytotoxic properties, supporting their further investigation for biomedical and biotechnological applications.
“Not stated” does not mean nobody paid — the database does not always record it.
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