Comparative Analysis of Commercial Colloidal Silver Products

Figures & data

Table 1 List of Commercial Silver Colloidal Samples Evaluated

Sample	Product Name	Supplier	Label Description	Ag Claim* (ppm)	Ag Found* (ppm)	Color	Settlement	Turbidity**	Ag Nanoparticles Presence
									Claimed	Detected
1	Sovereign Silver	Sovereign Silver www.soverignsilver.com	Bio-active silver hydrosol 0.8nm particles	10	12	No	No	Clear	Yes	No
2	Silver Biotics	American Biotech	SilverSol Technology	10	10	No	No	Clear	Yes	No
3	Silver Holistics	Silver Holistics	Colloidal silver	10	13.7	No	No	Clear	Yes	No
4	Kaiame Silver H2O	Naturally Sourced LLC	0.8 nm particles	10	24.0	No	No	Clear	No	No
5	Bio-active silver hydrosol	Silver Doc	0.8 nm particles	20	21.5	No	No	Clear	Yes	No
6	Argentyn 23	Natural Imunogenics	Bio-active silver hydrosol 0.8nm particles	23	22.7	No	No	Clear	Yes	No
7	Silver Crystalline Nano	Noche Inc.	Best Nano Silver	30	5.85	No	No	Clear	Yes	No
8	Silver Solution	My Doctor Suggests	Alkaline structured	30	26.5	No	No	Clear	No	No
9	Colloidal Silver	Institut Katharos	Colloidal silver	40	38.6	No	No	Clear	Yes	No
10	^ACS200	Results RNA, LLC	Advanced Cellular Silver	200	191.5	No	No	Clear	Yes	No
11	Colloidal Silver	Trace Minerals	Bio-active silver hydrosol	30	11.9	Pale yellow	Yes	Clear	Yes	No (see text)
12	MesoSilver	Purest Colloids www.purestcoloids.com	Colloidal silver	20	24.7	Yellow	No	Clear	Yes	10 −50 nm
13	Colloidal Silver	Silver Wings www.NPSWsilver.com	Immune support	250	321	Brown	No	Clear	Yes	15–50 nm
14	Coated Silver	Noble Elements www.coatedsilver.com	Proprietary coating	20,000	19,200	Dark Brown	No	Clear	Yes	10–12 nm

Notes: *Determined by atomic absorption spectrometry, **as determined by laser beam scattering.

Figure 1 UV-Vis spectra of samples #1–10. Table 1

Figure 2 UV-Vis spectra of samples 11–14. Table 1

Figure 3 FESEM images of samples #12–14: (left) MesoSilver, (middle) Silver Wings, (right) Coated Silver.

Figure 4 STEM images of samples #12–14: (left) MesoSilver, (middle) Silver Wings, (right) Coated Silver.

Figure 5 Images of Sovereign Silver (sample#1), Kaiame Silver (sample #4), Bio-active Silver Sol (sample#5), and Argentyn23 (sample#6) before and after the addition of sodium borohydride.

Figure 6 UV-Vis spectra of samples #1, #4, #5, and #6 before (left) and after (right) the addition of sodium borohydride.