Same, I can only get l-arginine in 500mg tablets over here in the UK from this place -
L-Arginine 500mg - Healthy Direct
On the back of the bottle it recommends taking "Take two to six tablets a day in between meals. Daily dose can be taken in one serving."
6 tablets at is only 3 grams, so I'd have to take 12 tablets (over the recommended dosage) to get my 6 grams as stated on the this thread.
Remak, did you get anyway with your investigations after reading your books?
Thanks.