Do not buy in powder form. Always buy good dark colored whole peppercorns. Dry in sun and grind in a mixer in small quantity to retain its color. Nutritional Values of Black Pepper (Peppercorn) Parameters Source: National Institute of Nutrition, ICMR, Hyderabad, India Tips for Storing Black Pepper and peppercorn Always buy and store black pepper and peppercorn spice in whole form. Grind or powder them in just before to use to get their freshness and flavour. Peppercorn may be stored for 5 years in an airtight container. 
<-- Picture of Black Pepper
Black pepper is high in antioxidants and is effective in protecting against tumors and certain cancers. It provides a great taste to vegetables, salads and soups. It is an important ingredient of garam masala used in Indian recipes.
Pepper Black Dry Value per 100g Moisture
Protein
Fat
Minerals
Fibre
Carbohydrates
Energy
Calcium
Phosphorus
Iron 18.200 gm
11.500 gm
6.800 gm
4.400 gm
14.900 gm
49.200 gm
304.000 K cal
460.000 mg
198.000 mg
12.400 mg Vitamins Carotene
Thiamine
Riboflavin
Niacin 1080.000 µg
0.090 mg
0.140 mg
1.400 mg Minerals & Trace Elements Magnesium
Copper
Manganese
Zinc
Chromium
Phytin Phosphorus171.000 mg
1.420 mg
4.140 mg
1.310 mg
0.074 mg
115.000 mg