Most people that take barley grass powder take somewhere between 1 to 4 ounces of barley grass powder per day.
There are about 6 grams of barley grass powder per teaspoon and 453.6 grams per pound. Therefore, a tablespoon of barley grass powder weighs a little over half an ounce.
Consuming a couple ounces of barley grass powder at a time is very easy. Just mix the powder in a glass of water to make your barley grass juice and drink it.