Table 4. Predictive values of IC₅₀ in mM (FFAs) for vanadium compounds and in vivo observations IC₅₀ in mM (FFAs) and decreasing blood glucose level.

Compounds	VOSO4	Complex I	Complex II	Complex III	Complex IV	Complex V
IC50 predicted	–	0.50	0.75	0.53	0.93	0.87
IC50 exp (±S.D.)	1.0±0.09	0.72±0.09	0.95±0.09	0.54±0.07	0.95±0.10	0.81±0.06
decreasing blood glucose level	16%	50%	33%	42%	11%	26%