Another cruciferous vegetable, collard greens are full of indoles, the phytonutrients that protect against hormone-related cancers including breast, ovary, testicular, and prostate cancer.
Research suggests that eating plenty of collard greens and other crucifers may cut your risk of such cancers in half.

Collard greens are also one of the best low-calorie sources of vitamins and minerals.
Collard greens are high in folic acid and also supply vitamin B6, both important to regulating blood levels of homocysteine.

Studies have shown that people with elevated homocysteine levels are three times likelier to have heart attacks than those with normal levels.

Collard greens are high in antioxidant carotenoids, iron, and potassium.
Collard greens contain calcium, but because collard greens are high in calcium blocking oxalates, look to other foods for this nutrient.

Many people think that if certain foods are good, a lot is better.
This is not always the case, and high doses of certain food are actually toxic.

Read about the healthy food, research the vitamins and minerals and check with your health care provider if you are unsure about how much to eat and how much may be too much.

The best way to get the daily requirement of 13 essential vitamins is to eat a balanced diet that contains a variety of foods and take a "Standardized" (quality) multivitamin supplement.