#TIL that in portugal, you can buy supplement tablets containing tryptophan. found one with 25mg per capsule today. gonna be taking it. it also has tyrosine in it, so despite the advice on the pack i don't think it wise to take it sooner than about 2 hours before going to bed (if you want to remember dreams, 500mg of tyrosine will see you wake up in the middle of REM cycles).