After testing corosolic acid, we also tested the corosolic acid-based banaba extract product glucosol (30) . The glucose uptake assay revealed that glucosol was activating glucose transport. Its activity was dose-dependent (Fig. 4) . However, since corosolic acid itself does not have any insulin receptor mediated glucose transport activity, the effect of glucosol is likely to originate from other chemical compounds in the banaba extract and not from corosolic acid.