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Type 2 diabetes and vitamin suppliments?

I'm currently taking metformin and glipizide and aspirin regiment. I noticed a "diabetes support pack" in the store the other day, could there be possible side effects if taking in addition to my meds?
Vitamins are:
A, for eye health
E & B6, for heart health
Lutein, for eyes
Cinnamon/Chromium Picolinate, for glucose and sugar metabolism
Alpha Lipoic Acid, to fight cell damaging free radicals
Slenium, to support the prostrate and immune system
folic acid, to maintain nerve function
Co Q-10, for heart health
vitamin C, for support to immune system

Will any of these counter- act the metformin or glipizide?

Also, is it true that ginkobiloba helps with memory retention? and could this also be used with the metformin/glipizide?