Wheatgrass is generally considered safe, although a few peoples have reported nausea, headaches, hives, or swelling in the throat within minutes of drinking its juice. Hives and swollen throat are often signs of a serious allergic reaction and should be handled as an emergency. Taste of wheatgrass juice is not good, but you can use it with water or any other juice.  

Because it is grown in soils or water and consumed raw, contamination with bacteria, molds, or other substances may be a concern. Women who are pregnant or breast-feeding should not use wheatgrass. However it is safe and everybody should use as it is a natural source of vitamins and minerals.

Wheatgrass is generally consumed as juice which is a complete food with regenerative and protective qualities. Its regular use improves perception and increases mental and emotional calmness. It aids in digestion, prevents graying of hair, skin diseases, asthma, arthritis and diabetes. In fact, because of its blood purifying qualities, wheatgrass is used in the treatment of leukemia and some other forms of cancer.

The normal dosage of wheatgrass juice is 25 to 50 gm twice a day on an empty stomach. It can be extracted from wheatgrass in a juicer. One disadvantage is that it cannot be stored and has to be consumed immediately. Wheatgrass can also be chewed and the pulp discarded. Though it is difficult to find wheatgrass or its juice in the market, some rare clinics do sell wheatgrass capsules.