Well, I wouldnt say its pointless, but I definitely wouldnt pay much for it.
Short of doing it IV or megadosing, you're really not going to get super results.
Still beneficial since its an amino and gives an immune system boost.
I'd go with the most cost effective form you could find.
Walmart even carries it now. (Around $10 for 300 or 400g tub-cant remember)