This site names Cinnamon Bark and describes it as studied for its role in supporting healthy glycemic control as part of a balanced formula.
The wording is deliberately modest: studied for a supporting role, as part of a balanced formula. It is not described as acting alone, and no amount is published.
Read this as one of four contributors to the formula's blood sugar positioning. The site's existing Berberine and Gymnema posts cover the other two botanicals; Cinnamon Bark and Chromium are the pair this standalone fills in.