Colloidal Zinc Concentrate 16 Oz. 240 PPM by Silver MTN MineralsColloidal Zinc Concentrate with Nano meter range particles. Most bioavailable zinc supplement.#Colloidal#Concentrate#Silver#Minerals·mineralssupplements.shopping·Jan 25, 2023Colloidal Zinc Concentrate 16 Oz. 240 PPM by Silver MTN Minerals