The nutrient fact, below, is based on 100 gram of dried peppercorn, I know it varies from fresh peppercorn, but I have still not found data for the fresh pepper.
Vitamins
Vitamin C, total ascorbic acid mg 76.4
Thiamin mg 0.328
Riboflavin mg 0.919
Niacin mg 8.701
Vitamin B-6 mg 2.45
Folate, DFE µg 106
Vitamin B-12 µg 0
Vitamin A, RAE µg 2081
Vitamin A, IU IU 41610
Vitamin E (alpha-tocopherol) mg 29.83
Vitamin D (D2 + D3) µg 0
Vitamin D IU 0
Vitamin K (phylloquinone) µg 80.3
Lipids
Fatty acids, total saturated g 3.26
Fatty acids, total monounsaturated g 2.75
Fatty acids, total polyunsaturated g 8.37
Cholesterol mg 0
Proximates
Water g 8.05
Energy kcal 318
Protein g 12.01
Total lipid (fat) g 17.27
Carbohydrate, by difference g 56.63
Fiber, total dietary g 27.2
Sugars, total g 10.34
Minerals
Calcium, Ca mg 148
Iron, Fe mg 7.8
Magnesium, Mg mg 152
Phosphorus, P mg 293
Potassium, K mg 2014
Sodium, Na mg 30
Zinc, Zn mg 2.48
Other
Caffeine mg 0