does high homocystein levels lower glutathione Homocysteine: Function, & Health Effects Homocysteine Extending your lifespan -
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That makes it hard to verify safety

Effect of green tea consumption on endothelial function and circulating endothelial progenitor cells in chronic smokers
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This can lead to fatigue, weakened immunity, or even chronic health issues

[DOI] [PMC free article] [PubMed] [Google Scholar] 57.Schultz G
