title: Effects of green tea extract on serum uric acid and urate clearance in healthy individuals.
abstract: OBJECTIVE
  The objective of this study was to investigate the hypouricemic effects of green tea extract (GTE) in healthy individuals.
  
  
  METHODS
  This study comprised 1-week control, 2-week interventional, and 1-week follow-up periods. Participants were assigned randomly at the interventional period to consume GTE at 2 (GTE2), 4 (GTE4), or 6 (GTE6) g/d. Levels of serum uric acid (SUA), uric acid clearance, and serum antioxidant power (using trolox equivalent antioxidant capacity assay) were measured at both ends of each study period.
  
  
  RESULTS
  Of 30 participants, 11, 11, and 8 received GTE2, GTE4, and GTE6, respectively. After 2 weeks of consumption, the mean SUA level tended to decrease in all groups, with no statistical significance. Serum uric acid reduction was greatest in GTE2 (from 4.81 ± 0.81 mg/dL to 4.64 ± 0.92 mg/dL, 3.53%). Uric acid clearance decreased significantly in GTE2 (from 11.37 ± 6.41 mL/min per 1.73 m to 7.44 ± 2.74 mL/min per 1.73 m, 34.56%, P < 0.05) and GTE4 (from 8.36 ± 3.41 mL/min per 1.73 m to 5.78 ± 2.33 mL/min per 1.73 m, 30.86%, P < 0.05). Serum antioxidant capacity (TEAC) increased significantly in GTE6 (from 32.77 ± 3.39 mg/mL to 35.41 ± 3.17 mg/mL, 8.06%, P < 0.05). There was no significant change in creatinine clearance. Gastrointestinal adverse events were common, but usually mild, with no medical treatment required.
  
  
  CONCLUSIONS
  Green tea extract may modestly lower SUA level and decreases uric acid clearance. Green tea extract also significantly elevated serum antioxidant capacity with a positive dosage effect. The effect of GTE on SUA in healthy individuals was short term. The effects of GTE on urate handling in patients with hyperuricemia or gout need to be determined.
authors.affiliation: From the *Division of Rheumatology, Department of Internal Medicine, and †Department of Biochemistry, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand.
authors.forename: Kanon
authors.initials: K
authors.lastname: Jatuworapruk
authors.forename: Somdet
authors.initials: S
authors.lastname: Srichairatanakool
authors.forename: Sakaewan
authors.initials: S
authors.lastname: Ounjaijean
authors.forename: Nuntana
authors.initials: N
authors.lastname: Kasitanon
authors.forename: Suparaporn
authors.initials: S
authors.lastname: Wangkaew
authors.forename: Worawit
authors.initials: W
authors.lastname: Louthrenoo
mesh_terms: D000328:Adult; D000975:Antioxidants / Q000378:metabolism; D003404:Creatinine / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007668:Kidney / Q000187:drug effects* / Q000378:metabolism*; D008297:Male; D010936:Plant Extracts / Q000494:pharmacology*; D013662:Tea; D013997:Time Factors; D014527:Uric Acid / Q000378:metabolism*
chemical_list: D000975:Antioxidants; D010936:Plant Extracts; D013662:Tea; D014527:Uric Acid; D003404:Creatinine