A few people can not take P5P, sorry I don't remember the details just made a note to self that not everyone is able to take this form of B6, although it was said to be rare. It's not rare if you are the one that is affected.

Do you have someone who does muscle testing for the supplements your son is taking? If not you might want to learn the method, lots of free tutorials on the web that are simple to learn, although some say it is best to have someone test you that is impartial. I find that I can test myself when I am feeling calm and centered, neutral.

It's worth a try.

Good Luck!

Janet