I've replied, including some links for your reference, but the post has been placed in spam quarantine, so will appear in due course, once it's been released by the mods.
The gist is that I suggest you consult your son's GP because a) we can't give medical advice here and b) there can be detrimental side effects.
I suggest checking with your son's GP about the merits of him taking this supplement, as it can cause detrimental side effects depending on factors including dose, duration of use, and other medications.
As you perhaps know, we can't give medical advice here (per rule 13), so I'll just reference some related resources:
