Long drawn research to restore beta cells. Gymnema studies have shown to do the same but since that does not give chance for "patents" it's on back-burner for most researchers.
I don't know much about patents or Gymnema Sylvestre Extract GS4, but after a quick check I see that All-Vita NorthWest in Oregon sells a Gymnema Sylvestre GS4 Leaf Supplement, and I'm sure other websites sell it, too. Link.
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