This site's own FAQ and footer both state this directly: Alpha Lipoic Acid may affect blood sugar.
Alpha Lipoic Acid is one of six named ingredients in this formula, independently associated with an effect on blood sugar — worth taking this caution seriously if you manage diabetes or take blood-sugar medication.
Talk to your doctor before starting if you take medication for diabetes or a related condition, and never adjust prescribed medication dosage based on a supplement alone.