Meso silver, Gold, Platinum and Optimum colloidal supplements are manufactured using complex proprietary technology which results in colloidal particles of totally uniform size and electrical charge. This charge is known as “Zeta Potential” because the charge is identical in all particles they continually repel one another and are not subject to the normal forces of atomic attraction (Van Der Walls force). Because of this property they can remain stable and viable almost indefinitely, and do not require storage in glass or coloured bottles. If stored as advised on this site. In reality we recommend usage within 3 years though much longer periods may be possible.