This site describes GlucoPril as supporting healthy blood sugar levels already within a normal range.
It positions the product for people who are not trying to correct a diagnosed problem. A benefit titled "Blood Sugar Already Within Normal Range" even adds: a wellness formula, not a diabetes medication.
If your own readings are outside the normal range, or you have been diagnosed with diabetes or prediabetes, this framing says the product is not aimed at you. Talk to your physician first.