Effects of Botanical Variation, Plant Part, and Extraction Technique on Mitragynine and 7-Hydroxymitragynine in Kratom (Mitragyna speciosa) Extracts Quantified by a Validated HPLC-DAD Method. - Krongrawa W; Ponphaiboon J; Koedruen J; Samran C; Limmatvapirat S; Limmatvapirat C (Molecules (Basel, Switzerland), 2026)