cant find nag need help

I can't find NAG (N-acetyl glucosamine) or NAC (N-acetyl cysteine) any where in Australia, does anyone know of another supplament that works the same way as these? that is widely availble, i dont think i can import these products from the u.s because the only one's i found online had shell fish in them, customs already destroyed my parasite kit. i really want to get rid of this leaky gut problem because i have body odour due to it and its ruining my life. any help would be great thanks in advance