Not a direct experience answer, but here’s info from The Thyroid Diet.
“There is one type of nutritive sweetner—stevia—that has no calories, and because it is not a carbohydrate, it does not influence blood sugar. It comes from a plant native to Paraguay. With a glycemic index of zero and no calories, stevia reduces cravings for sweets. Hundreds of studies show that stevia lowers blood pressure, helps prevent oral bacteria, and can even help regulate blood sugar. With no chemicals, it doesn’t pose some of the concerns that aspartame and the other artificial sweeteners present.
Stevia is approximately 300 times sweeter than sugar…”