The kynuerenine pathway makes a bunch of stuff besides niacinamide aka nicotinamide. 88% to 96% of tryptophan on average iirc, gets turned into kynurenine from

The kynuerenine pathway makes a bunch of stuff besides niacinamide aka nicotinamide. 88% to 96% of tryptophan on average iirc, gets turned into kynurenine from average intake.