nail down (someone or something)
to make certain or sure of something
I am trying to nail down the exact time that the meeting will begin.
Benefits of Swiss Chard
Swiss Chard Juice Nutrition
As with many dark greens, Swiss chard is a highly nutrient dense food. A meager 19 calories (three cups) contains 122% of your daily need of vitamin A, 50% of vitamin C, and 10% of iron. Swiss chard is also very high in Vitamin E, K, B6, riboflavin, calcium, magnesium, phosphorus, potassium, copper, manganese and fiber when eaten. Its a good source of zinc, folate and thiamin.