Male Pattern Hairloss in Teen

OOPS!

I actually had 2 questions.....that same 17 year old, has started losing his hair by the temples.

He started puberty early (around 12 had the hair under his arms) By 9th grade, he was shaving. He is now entering 12 grade and can pass for a 21 year old. Full beard, etc.

I went to a scalp specialist because he has really bad dandruff as well and I thought they were connected. He said no. Is there anything dietary that will help his hair either grow back or stop? he is very self conscience about it.