I'm trying it at the moment. Definitely seems to make a difference. But early days in my experiment and will have to wait to see if it pans out longer term.
The brand I'm taking is "Herbs of Gold" and it is sold as "Reflux Relief" (the original reason I started taking it, then I noticed the change in BG) - it contains 8.25g of phyllanthus emblica (amla) and 1.6g of gycyrrhiza glabra (licorice).
I've also seen a supplement online of just the amla - brand is "Paradise Herbs" 250mg caps labelled Amla, pure Ayurvedic extract.