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Colloidal Silver (Nanoparticle)
Also known as: colloidal silver, silver nanoparticles, ionic silver, silver colloid
Colloidal silver consists of microscopic silver particles suspended in liquid, historically marketed for antimicrobial and immune support claims. Current evidence does not support safety or efficacy for oral supplementation, and regulatory agencies have raised significant concerns about bioaccumulation and argyria (skin discoloration).
Primary uses
- Antimicrobial claims (not substantiated)
- Immune support claims (not substantiated)
How it works
- Proposed silver ion release with antimicrobial activity (in vitro only)
Dosage
- Typical range
- Typically marketed at 10-500 ppm (parts per million), but no established safe dose
- Timing
- If used, generally taken daily
- With food
- No established recommendation
- Duration
- Chronic use carries risk of argyria; bioaccumulation occurs with repeated dosing
- Special populations
- Not recommended for any population; avoid in pregnancy, lactation, and children
Forms
- Colloidal suspension (liquid)· 70/100
Safety
Common side effects
- Argyria (irreversible blue-gray skin discoloration)
- Argyrosis (eye discoloration)
- Gastrointestinal disturbances
- Neurological effects (with high cumulative exposure)
Contraindications
- Pregnancy and lactation
- Chronic or repeated use
- All populations (not FDA-approved as safe supplement)
Evidence notes
Very limited human evidence; no robust clinical trials support oral safety or efficacy. FDA and other regulatory bodies have issued warnings against colloidal silver supplements. Primary concerns: bioaccumulation, lack of established safe dosage, and risk of argyria with chronic use.
Grade D: Primarily pre-clinical or anecdotal; human efficacy not established.
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