> the effects of the pill lasted longer than injected insulin
A non-diabetic might think this was a good thing, but it's more likely to be a serious problem. The actual research article (http://pubs.acs.org/doi/abs/10.1021/bm401580k) is paywalled, so I can't see what its pharmacokinetics are, but I'm not inclined to give the benefit of the doubt; unlike most drugs, insulin needs rapid uptake, precise timing and precise dosing. Even if it did survive the digestive tract, interactions with foods that altered the effective dose, or sped up or slowed absorption, would be likely to sink it in actual use.
A non-diabetic might think this was a good thing, but it's more likely to be a serious problem. The actual research article (http://pubs.acs.org/doi/abs/10.1021/bm401580k) is paywalled, so I can't see what its pharmacokinetics are, but I'm not inclined to give the benefit of the doubt; unlike most drugs, insulin needs rapid uptake, precise timing and precise dosing. Even if it did survive the digestive tract, interactions with foods that altered the effective dose, or sped up or slowed absorption, would be likely to sink it in actual use.