2009
DOI: 10.3945/jn.109.110874
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The Pharmacokinetics of S-(-)Equol Administered as SE5-OH Tablets to Healthy Postmenopausal Women ,

Abstract: The soy isoflavone metabolite, S-(-)equol, has selective affinity for estrogen receptor (ER)beta and also antagonizes in vivo the action of dihydrotestosterone. It is therefore of interest as a potential new therapeutic agent in hormone-dependent conditions and is under development as a nutraceutical. Our objective in this study was to define the pharmacokinetics of natural S-(-)equol after administration of SE5-OH, a newly developed S-(-)equol supplement made by incubation of the equol-producing bacterium Lac… Show more

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Cited by 65 publications
(75 citation statements)
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“…It is cleared from plasma with a t 1/2 of 6 to 8 hours and excreted almost exclusively in urine. 37,41 The optimal clinical efficacy is more likely to occur with twice-daily administration rather than single-dose administration. This is important to consider when designing clinical studies of isoflavones.…”
Section: Bioavailability and Pharmacokineticsmentioning
confidence: 98%
See 1 more Smart Citation
“…It is cleared from plasma with a t 1/2 of 6 to 8 hours and excreted almost exclusively in urine. 37,41 The optimal clinical efficacy is more likely to occur with twice-daily administration rather than single-dose administration. This is important to consider when designing clinical studies of isoflavones.…”
Section: Bioavailability and Pharmacokineticsmentioning
confidence: 98%
“…42 Aglycones demonstrate rapid absorption and peak plasma concentrations are attained within 1 to 3 hours, depending on whether the isoflavones are taken with a meal or without a meal. 37 The effect of a meal is to delay absorption and shift the T max value. In contrast, for the A-glycoside conjugates, peak plasma concentrations of isoflavones typically occur 4 to 10 hours later due to a requirement for prior hydrolysis by intestinal brush border A-glycosidases, 43 which is a rate-limiting and time-dependent process.…”
Section: Bioavailability and Pharmacokineticsmentioning
confidence: 99%
“…The circulating half-life of S-equol in plasma, approximately 8 h, is comparatively long among polyphenols (24), and about half of the circulating S-equol exists as free aglycone (25). Serum S-equol concentrations are elevated to about 5 mm at 2 h after oral administration of 30 mg S-equol (24). In some Japanese S-equol producers, the S-equol concentration is over 1 mm (26).…”
Section: Discussionmentioning
confidence: 96%
“…Maximum plasma S-equol concentrations occur between 1 and 3 hours after oral administration and it is cleared from plasma with a half-life of 7 to 10 hours. 23,29,32,33 Consequently, over 80% of S-equol is excreted in the urine within 24 hours after administration. 23,32,33 Based on these pharmacokinetics to achieve sustained steady-state serum concentrations, a twice-daily dose, rather than a once-daily dose of S-equol is considered optimal.…”
Section: General Backgroundmentioning
confidence: 99%