Yes, agar and china grass are alternative names to the same product. Agar is a versatile hydrocolloid that is completely soluble in boiling milk and water. It is a healthy alternative to gelatin. It is a jelly-like substance extracted from seaweed. The china weed gives a feel of fulness, which makes it a part of many dietary substances. Such substances are mainly used for losing weight and stopping obesity. In Asia, it is also used as an effective digestive remedy to soothe an upset stomach or as a laxative.