The various in vitro techniques includes: In-vitro studies on insulin secretion, In-vitro studies on glucose uptake, Studies using isolated pancreatic islet cell lines, Assay of Amylase Inhibition and Inhibition of α-Glucosidase Activity
you can use certain formulations as food supplements (capsules...), after a study of chronic toxicity.
concerning the capsules, it is necessary to make them from powder, but it is necessary to determine the exact dose of: the extraction yield and the dose of administration.