Colloidal silver is a dietary supplement and is typically 10-15 parts per million. Anyone can make colloidal silver.  Purchase a $39 silver generator and make it, but you have no idea of it’s efficacy or effectiveness.
Chelated silver has to be made in a lab.  You cannot make it yourself.  Chelated silver is typically 100-110 parts per million.  Ours is made in an FDA approved lab and bottled in an FDA approved bottling plant.  We have a certificate of analyst on every batch.