Greenpet Colloidal Silver is 25-30 ppm strength and is 100% safe and natural.
Colloidal silver is a natural substance consisting of positively charged 99.99% quality silver.  This is suspended in a colloidal state in steamed, distilled pure water that is energized with Dow quartz crystal.
 
Suitable for all species including dogs, cats, horses, fish, poultry, birds and farm stock.