Good god man, a single teaspoon in my tea is too much. If I do super strong tea or coffee, like 3 tea bags in a half cup, mixed with half whole milk, a full teaspoon is about right to taste.

10 is just too much, it's horrible for you too, even if you don't get diabetes, it crashes your energy level, cut it out for a couple of weeks then get a big dose of sugar and you will see what it does to you.