WHat does he mean by "boosting"?

I was taking 16 grams of vitamin C when GBS was approaching and it kept it manageable. I am now recovering since it hit its peak in October and I am taking 8 grams of C….as well as lots of B complex and other supplements. I am not in need of any pain medication. So……you never know which doctor to listen to…..I know it has helped….I have had GBS twice. When I stopped the vitamin C, I came down with such pain…I thought I was run over by a truck.