⚠ Active warning — SupplementIndex Safety Review: FDA: no therapeutic benefit. Irreversible argyria. Not GRAS.
📰Read the full Colloidal Silver evidence review on GMJ News →Complete clinical article, references and updates on news.gmj.ge. This page is the structured safety summary.⚠ HIGH RISK — see overview [1]
ℹ️ Not obtained from food. Not applicable — this substance is not a dietary nutrient and should not be consumed as food.
🔬 Lab interpreter
ℹ️ No validated blood test. There is no established laboratory test to assess status or guide dosing for this ingredient. Clinical response and symptoms are the practical guide.
⚕ For professionals — confirm ranges against your local laboratory.
Clinical verdict
Colloidal silver is one of the clearest supplement frauds: NO evidence of internal benefit, risk of IRREVERSIBLE argyria (permanent blue-gray skin), and FDA has explicitly ruled it 'not safe and effective' (1999). Silver has genuine TOPICAL antimicrobial use (wound dressings) but oral ingestion deposits silver in skin, organs, and eyes permanently. The 'Blue Man' (Paul Karason) became the public face of argyria from colloidal silver use [1].
1 How much do I need?
👤 Adults: Specific dosage data under clinical review
👴 Elderly: Specific dosage data under clinical review
🤰 Pregnancy: See guidance
AVOID — silver deposition is permanent; fetal effects unknown [1].
👦 Pediatric: See guidance
Not recommended [1].
🏃 Athletes: Standard dose
⚖️ Obesity: Standard dose
Fat-soluble compounds may require dose adjustment in obesity.
🩺 Renal: Consult specialist
Dose adjustment may be needed in renal impairment.
🌱 Vegan: Standard dose
How to take
🍽 Timing: See overview [1].
💊 With food: See overview [1].
🚫 Avoid: See overview for contraindications [1].
2 Which form?
| Form | Bioavailability | Vegan | Cost |
|---|---|---|---|
| ['Various', 'see overview', 'See overview for forms and risks [1].'] | Standard | Check label |
3 Common questions
Key safety point ▼
Colloidal silver is one of the clearest supplement frauds: NO evidence of internal benefit, risk of IRREVERSIBLE argyria (permanent blue-gray skin), and FDA has explicitly ruled it 'not safe and effective' (1999). Silver has genuine TOPICAL antimicrobial use (wound dressings) but oral ingestion deposits silver in skin, organs, and eyes permanently. The 'Blue Man' (Paul Karason) became the public face of argyria from colloidal silver use [1].
4 Clinical evidence
Strong
See overview [1]. HIGH
Moderate
See overview [1]. MODERATE
Insufficient
See overview [1]. LOW
5 Safety, toxicity & adverse events
Absolute contraindications
✕ Should not be used — no proven benefit and risk of argyria (permanent blue-grey skin discoloration)
✕ Pregnancy and children — silver crosses the placenta and accumulates
Relative
⚠ Concurrent quinolone/tetracycline antibiotics and levothyroxine — silver impairs their absorption
⚠ Renal or neurological impairment — risk of silver accumulation
🚩 Red flags
● HIGH RISK — see overview for critical safety alerts [1]
6 Interactions
Drug interactions
Antibiotics (quinolones, tetracyclines) Major
Mechanism: Silver may reduce antibiotic absorption [1].
7 Cite this page
Vancouver: Pkhakadze G. Colloidal Silver — safety profile [Internet]. Tbilisi: PHIG; 2026 [cited 2026 Aug 31]. Available from: https://supplement.ge/ingredients/colloidal-silver/
APA 7th: Pkhakadze, G. (2026). Colloidal Silver — Safety profile. Public Health Institute of Georgia. https://supplement.ge/ingredients/colloidal-silver/
📋 Editorial information
Author: Prof. G. Pkhakadze, MD, MPH, PhD
Institution: Public Health Institute of Georgia (PHIG)
Affiliation: David Tvildiani Medical University (DTMU)
First published: January 2026
Last reviewed: 2026-05-29
Next review: March 2027
References: 2 cited sources
COI: SupplementIndex receives no funding from supplement manufacturers. All content independently authored by PHIG.
Process: Systematic literature review
📄 License & reuse
Published under Creative Commons Attribution 4.0 International (CC BY 4.0). You may share and adapt for any purpose with attribution.
Pkhakadze G. "Colloidal Silver — Safety Profile." SupplementIndex, PHIG, 2026. https://supplement.ge/ingredients/colloidal-silver/ CC BY 4.0.
GP
Prof. G. Pkhakadze, MD, MPH, PhD
Professor of Public Health · Head of Department, DTMU
Editor-in-Chief, Georgian Medical Journal (ISSN 3088-4322)
Chair, Public Health Institute of Georgia · UEMS Public Health Section
Educational and public health purposes. CC BY 4.0. Consult your healthcare provider before starting any supplement. Corrections: info@accreditation.ge. Publisher: PHIG