As of now the best that you can get at a GNC store in India is 1000mg VC tablets.
And in any case - due to heavy import duty and other taxes (as all GNC products in India
are imported from USA) the prices are absurdly prohibitive.
Recently Vitamin Shoppe products have also entered India at even higher prices than GNC.
I hope that at some stage in the future the prices may become more reasonable due to
competition.
Most of the Indian made supplements are from raw material sourced from China.
Till then I would strongly suggest to carry your supplements from USA for the entire duration of your
stay in India.