It's possible. Bromocriptine is a Dopamine agonist that lowers serum prolactin that is responsible for lactation. In women with high prolactin, it may help ovulation, improve implantation. Compelling literature (animals) suggest that lack of Dopamine may induce Insulin resistance and may reduce arterial fatty uptake and shift to carb uptake. Thus, its possible bromoriptine may enhance Insulin sensitivty.