Table 1.
Bioavailability of green tea catechins.
| Catechin source | Initial dose | Plasma concentration (peak time) EGCG, EGC | EGC in urine/24 h (peak time) | References |
|---|---|---|---|---|
| Green tea (bottled) | EGCG 230 μmol | EGCG ~55 nmol/L (~1.9 h) | ~33 μmol | Clifford et al., 2013 |
| EGC 257 μmol | EGC ~205 nmol/L (~2.2 h) | |||
| Green tea (brewed) | EGCG 214 mg | EGCG ~80 nmol/L (~1.3 h) | ND | Henning et al., 2004 |
| EGC 270 mg | EGC ~740 nmol/L (~1.3 h) | |||
| Green tea extracts | EGCG 193 mg | EGCG ~150 nmol/L (~2.7 h) | ND | Henning et al., 2004 |
| EGC 25 mg | EGC 110 nmol/L (~2.6 h) | |||
| Green tea extracts | EGCG 88 mg | EGCG ~135 ng/ml at 4 h | ~3.0 mg (3–6 h) | Lee et al., 1995 |
| EGC 82 mg | EGC ~ 140 ng/ml at 1 h | |||
| Green tea (bottled) | EGCG 235 μmol | EGCG ~55 nM (~1.9 h) | ~33 μmol | Stalmach et al., 2009 |
| EGC 260 μmol | EGC ~126 nM (~2.2 h) | |||
| EGCG EGC | EGCG 688 mg | EGCG ~1.3 μmol (~3.9 h) | ND | Van Amelsvoort et al., 2001 |
| EGC 459 mg | EGC ~5.0 μmol (~1.7 h) | |||
| Green tea extracts | EGCG 110 mg | EGCG ~119 ng/ml (~1.6 h) | ~3000 μg (4–6 h) | Yang et al., 1998 |
| EGC 102 mg | EGC ~148 ng/ml (~1.4 h) |