Monk Fruit is a perfect 1 for 1 substitute

It has zero carb and a glycemic index of "0" and is a totally natural product - so go for it - it won't move you blood sugar a single tick

Yes, it is okay to replace a teaspoon of sugar in your tea with monk fruit. Monk fruit is a natural sweetener that is derived from a small melon-like fruit native to Southeast Asia. It is much sweeter than sugar, so you only need a small amount to sweeten your tea. Monk fruit is also calorie-free and does not raise blood sugar levels, making it a great alternative to sugar for people with diabetes.