MesoSilver 250ml is a premium colloidal silver supplement produced by Purest Colloids. It contains ultra-fine silver nanoparticles averaging 0.61 nanometres in size, suspended in pure deionised water, with a concentration of 20 parts per million (ppm). This formulation offers a high particle surface area, up to 600 times greater than many competing products, enhancing its bioavailability.