Wheatgrass Benefits and Side Effects, wheatgrass powder
What does wheatgrass do? Wheatgrass has been promoted as one of the most potently healthy substances on earth. Wheatgrass contains chlorophyll, amino acids, minerals, enzymes, vitamins and antioxidants (e.g. carotenoids and flavonoids). 
Fresh leaf buds of wheatgrass (tritium aestivum or agropyron cristatum) are often crushed to form a wheat grass juice  Wheatgrass juice is a popular health drink. While wheatgrass may also be dried or dehydrated then grounded into wheat grass powder. Without much scientific evidence, wheatgrass is promoted that it can benefit people at risk of cancers, menopause, colon and liver diseases. A website publisher claims wheatgrass can offer benefits of preventing gray hair and bad breath. Another website publisher says wheatgrass juice is a detergent in our body, and wheatgrass juice can help prevent tooth decay. The publisher further suggests readers to gargle with wheatgrass juice for a sore throat, and use wheatgrass juice for skin problems such as eczema or psoriasis. Wheat grass juice has even claimed to have benefit on high blood pressure and scars formed in the lung. Not sure, if these claims have scientific supports. Wheatgrass may possibly have lots of health benefits, as it has a high content of fibers and antioxidants. ______________________________________________________________________
Let us review some interesting recent studies on wheatgrass benefits:
Wheatgrass benefits - on ulcerative colitis In a randomized, double-blind study, Ben-Arye E and co-workers from Israel Institute of Technology, supplemented 23 patients suffered from ulcerative colitis with 100 cc of wheatgrass juice daily for one month. They found significant improvements of these patients in disease activity index such as rectal bleeding and bowel movement. They found no serious side effects.
Wheatgrass benefits - on thalassemia Researchers treated patients with thalassemia with 100 mLof wheatgrass juice daily. They found a decrease in the need of packed red cells by 25% or more. They didn't notice any adverse side effects.  Thalassemia is an inherited autonomic recessive blood disease. In thalassemia, the genetic defect results in reduced rate of synthesis of one of the globin chains that make up hemoglobin. The disorder leads to anemia.
Wheatgrass benefits - on rheumatoid arthritis Researchers from Finland included wheatgrass juice and berries in their special diets for patients suffered from rheumatoid arthritis. During the study, researchers noticed the improvement of joint stiffness and pain and quality of sleep. 
Wheatgrass benefits - anti-cancer (anti proliferation effect) Wheatgrass was found to have cytotoxic effect on human acute promyelocytic leukemia cells HL60 while no significant cytotoxic effect was observed on other type of cells. [Pak J Pharm Sci. 2011 Jul;24(3):243-50]
Wheatgrass benefits - on gray hair There is no report that wheatgrass prevents gray hair (up to the date of August 17, 2011)
Wheatgrass benefits - on lung scar There is no report that wheatgrass can diminish scars in lung (up to the date of August 17, 2011)
Wheatgrass benefits - on bad breath There is no scientific evidence that wheatgrass can stop bad breath (up to the date of August 17, 2011)
Wheatgrass benefits - on menopause There is no scientific evidence that wheatgrass offers benefits to people at menopause (up to the date of August 17, 2011)
Wheatgrass benefits - on tooth decay There is no scientific evidence that wheatgrass offers benefits to people at risk of tooth decay (up to the date of August 17, 2011)
I can't understand how those marketers can come up with so many health benefits for wheatgrass. I notice, one publisher applies chlorophyll benefits to wheatgrass. Wheatgrass contains chlorophyll but chlorophyll in wheatgrass is associated with fibers or even encapsulated in fibers. Chlorophyll in supplements may be in fine powder form. Thus, the benefit of chlorophyll supplement is different from the benefit of wheatgrass.
Wheatgrass side effects Wheatgrass is probably safe for most healthy adults. However, wheatgrass side effects may happen with individuals, the side effects may include nausea, appetite loss and constipation.
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 Ben-Arye E, Goldin E, Wengrower D, Stamper A, Kohn R, Berry E. Wheat grass juice in the treatment of active distal ulcerative colitis: a randomized double-blind placebo-controlled trial. Scand J Gastroenterol. 2002 Apr;37(4):444-9.  Marawaha RK, et al, Wheat grass juice reduces transfusion requirement in patients with thalassemia major: a pilot study. Indian Pediatr. 2004 Jul;41(7):716-20.  Hänninen O, Rauma AL, Kaartinen K, Nenonen M. Vegan diet in physiological health promotion. Acta Physiol Hung. 1999;86(3-4):171-80.  From Wikipedia, the free encyclopedia.