Table 4.

The relative bioavailabilities and brain targeting indexes for oral administration of gastrodin alone, physical mixture of gastrodin and borneol, and the SRSDs, respectively (n=5).

Parameter	Gastrodin group	Physical mixture group	SRSDs group
F (gastrodin in plasma, %)	100.0	98.4	94.8
F (gastrodigenin in brain, %)	100.0	205.6	173.7
BTI	1.00	2.09	1.83