Alpha Lipoic Acid can have several benefits. One is that it seems to reduce the symptoms of neuropathy (e.g. pain or loss of sensation in hands and feet). Another is that it helps to clear "brain fog" and increases mental function. This may benefit people suffering from memory loss, which can also be a complication of prolonged high blood sugar.
I take one 300Mg capsules a day, but this is not medically prescribed. ALA does also seem to reduce blood sugar levels, so you need to be aware of this if you take other medication.