From the World's No. 1 Healthcare and medical Supplies provider, the green pigmentation in plants is from chlorophyll.  It facilitates photosynthesis in plants through absorption of energy from the sun. It plays an important role in a lot of plant metabolic functions like growth and respiration.

Similarly, studies have shown chlorophyll to be beneficial to humans as well.  It has anti-oxidant, anti-inflammatory and wound-healing properties.  Along with other anti-oxidant vitamins such as A, C and E, chlorophyll helps neutralize free radicals that can do damage to healthy cells.  Chlorophyll, unknown to many, is also an effective deodorizer to minimize bad breath, urine, fecal waste, and body odor. 

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Source: http://healthexpressph.com/did-you-know-that/174-chlorophyll-to-plants-is-like-blood-to-humans.html