L-Tryptophan + Carbohydrates - How Many Carbs Per Gram?

It is often said you should take carbs, always an unspecified amount, with L-Tryptophan to make it easier for it to get to where you want it, the brain. It helps it in competition with other aminos from what I understand. How much though and if you haven't eaten in say 2-3 hours do you still need to do this? I am on a low carb diet so I'd prefer to keep the carb number as low as possible. I know I can take 5-HTP, but that interferes with dopamine production after a few weeks as per MYASD. Thanks!

Taking 25mg P5P with it and 1000mg C. Is that ok with say 3 Grams of L-Tryptophan or do I need more?