That is a rather ambiguous statement, and one which I'm thinking is not particularly correct, wrt vitamins. Water-soluble vitamins can be absorbed easily, and fat soluble vitamins require only that there be some fatty acids present in the bolus with the vitamins - but it doesn't particularly matter WHICH fatty acids. The fats from processed Raman noodles will aid fat-soluble vitamin absorption just as easily as will natural fats found in nuts and certain fruits (like bananas, which are actually pretty high in fats).
Of course it is ambiguous. I was speaking broadly.
And it is true. Catalysts are needed for many substances to react.