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Baseline plasma levels in humans are low (near undetectable without intake), but consuming 4 cups of green tea (~500 mL) can provide ~100 mg, leading to peak plasma levels of ~25 mol/L

Evid Based Complement Alternat Med 2018(1):8438101 Sayed WF et al (2015) Efficacy of Caltropis procera and Ficus sycomorus extracts in treating MRSA (methicillin-resistant Staphylococcus aureus)-keratitis in rabbit

59 Alopecia areata, a common autoimmune condition with a lifetime risk of approximately 1.7%, is characterized by immune responses to autoantigens