Markowitz JS, DeVane CL, Lewis JG, Chavin KD, Wang JS, Donovan JL. Effect ofGinkgo bilobaExtract on Plasma Steroid Concentrations in Healthy Volunteers: A Pilot Study.
Pharmacotherapy 2005;
25:1337-40. [PMID:
16185177 DOI:
10.1592/phco.2005.25.10.1337]
[Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
STUDY OBJECTIVE
To determine if a standardized ginkgo supplement significantly alters concentrations of circulating androgenic steroids in humans.
DESIGN
Open-label, fixed-treatment order, crossover study.
SETTING
University general clinical research center.
SUBJECTS
Eleven healthy volunteers (six men, five women).
INTERVENTION
Volunteers received ginkgo biloba 240 mg/day for 14 days.
MEASUREMENTS AND MAIN RESULTS
Plasma concentrations of cortisol, 11-deoxycortisol, 17alpha-hydroxyprogesterone, testosterone, dihydrotestosterone, dehydroepiandrosterone sulfate, sex hormone-binding globulin, androstenedione, and free testosterone, as well as free androgen index and combined concentrations of androsterone sulfate and epiandrosterone sulfate, were analyzed in all subjects before and after their 14-day course of ginkgo biloba. Ginkgo biloba did not significantly alter endogenous steroid levels compared with baseline values (p < 0.05).
CONCLUSION
A 14-day oral administration of a widely used, standardized ginkgo extract at a generally advocated dosage of 240 mg/day did not significantly alter concentrations of major circulating steroids in men and women.
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