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The International Scientific Association for Probiotics and Prebiotics updated the definition of postbiotics as non-viable microbial cells and/or their components with health benefits to the host (Salminen et al., 2021)

Long-Term Protocols: The most clinically relevant studies evaluated subcutaneous doses of 0.25 mg (250 mcg), 0.5 mg (500 mcg), and 1 mg (1,000 mcg) administered daily for 24 weeks

Note also the increase in production of antioxidant rejuvenators like superoxide dismutase and glutathione

The result is dramatically improved bioavailability, often showing absorption rates that are 10-20 times higher than traditional oral glutathione supplements