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Non-linear oral bioavailability and clinical pharmacokinetics of high-dose Andrographis paniculata ethanolic extract: relevant dosage implications for COVID-19 treatment. Songvut P, Akanimanee J, Suriyo T*, Pholphana N, Rangkadilok N, Panomvan D, Puranajoti P, Satayavivad J*. Pharm Biol. 2025;63(1):42-52.