What is a good hair growth treatment?

My boyfriend wants to grow his hair out without waiting through the awkward inter-midden growth stages. What is a good product for him to use and what would the possible side effects be?

5000 mcg of biotin taken daily. No real side effects or possibilty of overdosing as biotin is water soluble & the body excretes what it does not use.

Lee Stafford Hair Growth Treatment