Would my client benefit from taking berberine as I found on Amazon to reverse symptoms of Type II diabetes?

This is a good choice as there are clinical studies showing multiple benefits of berberine and both your wife and your client would have improvement in taking this substance with the product you identified through Amazon containing a 500 mg dose (SoActive^® Berberine, from Triquetra). And twice a day would be safe and effective, especially given its superior pharmacokinetic properties in the formulation they have devised to improve bioavailability.