Supplement for Low Carb

Recently, I read an article about how higher carb diets combined with whey protein are used to treat depression (methods to increase tryptophan levels in the brain). In my past experiences with lower carb diets (under 30g/day or 150-175g/day) I have always reached a point (after 1-3 weeks) when my mind was in a constant state of shock. My T levels seemed to go down, I had no creativity, etc. Now I know what Ori meant when he said that ketogenic dieter can’t handle stressful situations! I was thinking that, perhaps, someone could create a supplement (or maybe there already is one) that helped the body produce normal amounts of serotin while on a carb-restricted diet. If so, does anyone have any ideas as to what this would be comprised of?