Starting at around 100mg p5p my dream recall comes back and stays there every night. I like that.
I go by symptoms more than lab tests. My pyroluria lab test came back negative, but I have all the symptoms and feel MUCH better on zinc (15mg) and p5p so I take it. In fact I can hardly handle going off it. If I have severe stress my b6 deficiency symptoms (insomnia and vocal tics) return.
I have no idea how accurate spectracell is. I have not heard it recommended by any top CFS / pyroluria docs...not to say it isn't good or maybe just unknown by me.
As far as zinc, I don't like to take anything with copper in it (I tested high). Maybe the Jarrow Stuff with 1mg copper is ok for you? I like
Pic Mins by Thorne..containing 15mg of zinc picolinate and trace minerals. Too much supplemental zinc.. Like 30mg..causes metal (copper? Lead?) detox symptoms in me..agitation, poor decision making ability, etc