Studies have shown zinc supplementation can reduce blood sugar and A1C, have an antioxidant effect, lower blood sugar and even help treat some of the complications related to diabetes. Large doses of zinc can inhibit the absorption of other minerals like copper, so be sure to ask for guidance of the appropriate dosing.

https://www.stamfordhealth.org/healthflash-blog/diabetes-and-endocrine/type-2-diabetes-natural-remedies/