CARSON CITY, NV / ACCESSWIRE / January 24, 2024 / Pharmagreen Biotech, Inc., (OTC PINK:PHBI), "Pharmagreen" or the "Company" is pleased to announce the signing of a supply agreement with SierraSil® Health Inc., a manufacturer specializing in a proprietary natural hydrothermal mineral complex known as SierraSil®. This patented mineral complex, developed by SierraSil® Health Inc., adheres to rigorous standards is supported by two US patents and extensive clinical research. Pharmagreen has secured