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The most studied immune peptide
A six-month randomized controlled trial showed that daily consumption of glutathione supplements increased GSH levels by 30-35% in erythrocytes, plasma, and lymphocytes
2020 Mar 15;14(2):153-167
Most people are unbothered by injectables
Another meta-analysis found that Chinese herbal preparations that contained astragalus increased levels of white blood cells and reduce the the prevalence of nausea and vomiting in people undergoing chemotherapy for colorectal cancer (Taixiang 2005)
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