Vitamin powder

My gf works at a health food store and got us a nice big cannister of powdered vitamins, I've heard of people using centrum silver or other human vitamins ground up as a supplement.
Here's a list of what all is in the there per tablespoon:

• 
  total carbohydrates 5g
  Sugars 4g
  Protein 2g
  Vitamin A (100% as Beta Carotenel) 20,000 IU,
  Vitamin C (Ascorbic Acid) 510 mg,
  Vitamin E (as d-Alpha Tocopherol) 390IU,
  Thiamin (Vitamin B-1, as Thiamin Mononitrate) 30 mg,
  Riboflavin (Vitamin b-2) 30 mg,
  Niacin (as Niacinamide) 110 mg
  Vitamin B-6 (as Pyridoxin HCL ) 30 mg
  Folic Acid (folate) 400 mcg
  Vitamin B-12 (as Cobalamin) 30 mcg
  Biotin (as d-Biotin) 30 mcg
  Pantothenic Acid (as d-Calcium Pantothenate) 110 mg
  Calcium (from Calcium Carbonate, Citrate/Malate) 800 mg
  Iodine (from kelp{Laminara digitata}) 22.5 mcg
  Magnesium (from Magnesium Oxide, Citrate) 400 mg
  Zinc (from Zinc Oxide) 20 mg
  Selenium (as I-Selenomethionine) 60 mcg
  Copper (from copper Gluconate, Citrate) 1 mg
  Manganese (from Manganese Citrate) 2 mg
  Chromium (from Chromium Aspartate, Polynictinate) 60 mcg
  Molybdemum (from Sodium Molybdate) 75 mcg
  Potassium (from Potassium Citrate) 99 mg
  Inositol 110 mg
  Choline (as Choline Citrate) 110 mg
  Citrus Bioflavonoid Complex (50% flavonoids) 100 mg
  Rutin Bioflavonoid Complex 30 mg
  Boron (from Boron Amino Acid Chelate) 25 mcg
  Silicon(from Silicon Dioxide) 10 mg

Anything here seem dangerous? I have only been supplementing with mineral + D3 powder and am thinking I should throw some vitamins in also (or at least try adding this to the ff media).

Any suggestions?

-Tad