You want answers and I can see that no one has offered any advice to your question.
When it comes to vitamins, there are a number of things to look at. If you are going to waste money, then you want to make sure that you are getting your value.
To simply the quote, most of the cheap store pills don't get absorbed by the body-only a small portion and the rest is literally flushed down the toilet. That's why you will see things as water soluble, fructose compounding, and a list of other terms to make you believe that they are the best on the market. True they are better than the cheap store bought pills. I'd said the more absorbable, the higher the price tag. I'd much rather opt for a cheaper price tag, but i'd be wasting my money on something I wouldn't take consistently and something that my body is not absorbing either.
I hope that answered your question about conduits. It's just merely another means for absorbability factor.