@pattisnag SNAKE OIL! Run away.
In 2021, the FTC issued a warning against companies making these claims:
https://consumer.ftc.gov/consumer-alerts/2021/09/ftc-warns-diabetes-treatment-sellers-cease-and-desist-questionable-claims
I just took a quick look on Amazon, and found over a half dozen supplements making this claim - each with different ingredients. Life Extensions, on their own site, offers at least nine different products to maintain or improve blood sugar levels -- with various claims like the for Tri Sugar Shield: "Phloridzin is a polyphenol compound extracted from apple root bark that may inhibit glucose absorption into the bloodstream." "Mulberry promotes insulin sensitivity, as well"
And these for Glycemic Guard: "Clovinol® is a water-soluble extract of unopened clove buds (Syzygium aromaticum). It is rich in polyphenols that promote healthy liver function and glucose metabolism." and "Delphinol® is a standardized extract of the maqui berry (Aristotelia chilensis) packed with health-promoting anthocyanin and delphinidin compounds."
Or CinSulin, containing " InSea2® may also target hidden sugars that contribute to blood sugar spikes after meals, inhibiting the caloric impact of sugary foods." and cinnamon water extract.

So, if any one of these is a miracle cure, why have multiple products? And why add the caption "Supports already-healthy blood sugar levels" if they think it will reduce unhealthy levels?

RESIST! If there was a miracle cure, every person with Type II diabetes would be buying up the supply - including members of my family.
Like other chronic conditions, Type II diabetes is controlled, for most people, with a combination of healthy body weight, good nutrition, exercise and medication, not with a single magic pill.