This question comes up from time to time, and part of the reason is because there is some confusion about wheat germ vs wheatgrass. Wheat germ is the inner kernel of a grain of wheat and is a high iron food and not recommended for thals as a supplement. However, wheatgrass is the blade of grass that sprouts from a grain of wheat and is not a relatively high iron source.
Depending on the form, juice, tablet or extract taken as a spray, the iron content of wheatgrass varies.
I will reprint a post I just did recently at
http://www.thalassaemia.wsWheatgrass tablets contain about one third of a milligram of iron per 1000 mg of wheatgrass. Most tablets are 500 mg so if you took 6 tablets a day you would get about one mg of iron added to your diet, comparable to what a 3 ounce (84 grams) serving of chicken would contain. It's not a high amount, but like most vegetable products, it does contain some iron. However, keep in mind that iron from vegetable matter is not as easily absorbed as the iron from meat.
I would think the potential benefits of wheatgrass outweigh the small amount of iron added to the diet.
One other alternative is the wheatgrass spray sold by http://wheatgrassactive.com
It is very low in iron.
These statistics for iron content were provided by Dr Chris Reynolds:
Iron Content
Indoor grown fresh wheatgrass juice
22 mg. per litre = about 2/3 mg per 30 ml serving
Dehydrated
337mg. per kilogram = .337mg per gram
Dr. Chris Reynolds’ Wheatgrass extract: 0.16 mg. per litre
Recommended adult daily dose 20 sprays [2.8mls] -equivalent to 0.00045 mg Fe per day
So, although there is some iron content to wheatgrass, it is not high and the spray is very low in iron...almost none. You will receive far more iron from many foods such as one serving of red meat.