The following is extracted from
http://www.nhs.uk/livewell/superfoods/Pages/is-wheatgrass-a-superfood.aspx
Wheatgrass contains chlorophyll, vitamin A, vitamin C and vitamin E, iron, calcium and magnesium.
Nutrition claims
Despite claims that a 30ml (1oz) shot of wheatgrass contains as many nutrients as 1kg (2.2lbs) of your finest veggies, tests show that, pound for pound, the nutrient content of wheatgrass juice is roughly equivalent to that of common vegetables, such as spinach and broccoli.
The dietitian's verdict
Alison Hornby, a dietitian and BDA spokesperson, says: "There is no sound evidence to support the claim that wheatgrass is better than other fruits and vegetables in terms of nutrition. It cannot be recommended above any other choices in this food group.
"Although it contributes towards your recommended daily intake of fruit and veg, a single shot of wheatgrass doesn't count as one of your 5 A Day. But if you're a big fan, you could combine a shot with a fruit or veg smoothie."
Note: Alison Hornby's website is http://www.alisonhornbynutrition.com/