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Taking some new hair growth vitamins and I have a few questions?

I'm 17, and I'm going to be taking these vitamins called MAXI-HAIR by Country Life. I wanted to know if there are any problems taking certain vitamins or minerals with levels as high as 2,000 % +, as shown in the supplement facts below. Also, they come in the form of tablets and the bottle says they are "time released" however the size is about 2x bigger than I'm used to. Is it safe to cut the tablets in to 2 or 3 small pieces and then take them?

Please read below

Supplement Facts :
Serving Size:
Servings Per Container: 45

Amount per Serving % Daily Value

Vitamin A as retinyl palmitate 5000 IU 100%

Vitamin C as ascorbic acid, rose hips 200 mg 333%

Vitamin E as d-alpha tocopheryl acid succinate 50 IU 167%

Thiamin (B1) as thiamine HCl 30 mg 2000%

Riboflavin (B2) 50 mg 2941%

Niacin (B3) as niacinamide 50 mg 250%

Vitamin B6 as pyridoxine HCl 50 mg 2500%

Folate,Folic Acid,Folacin 400 mcg 100%

Vitamin B12 as cyanocobalamin 50 mcg 833%

Biotin 2000 mcg 667%

Pantothenic acid as d calcium pantothenate 50 mg 500%

Calcium as calcium carbonate 200 mg 20%

Iodine as kelp 225 mcg 150%

Zinc as zinc amino acid chelate 15 mg 100%

Selenium as selenium amino acid chelate 50 mcg 71%

Copper as copper amino acid chelate 1 mg 50%

MSM (Methylsulfonylmethane) 600 mg*

L Methionine free form 250 mg*

Canola Fatty Acid Source of unsaturated fatty acids, linoleic and oleic acids 200 mg*

Horsetail Extract 2:1 Ratio (Leaf/Stem) 100 mg*

L Cysteine as L cysteine HCl 100 mg*

Inositol 50 mg*

PABA (para-aminobenzoic acid) 50 mg*

Choline from 50mg choline bitartrate 23
Also, I know you can get poisoning from too much iron through pills, can you get poisoning from too much of anything else through pills?