Best supplement to take for fast hair growth?

You can use horse shampoo and conditioner. This might sound crazy but it is actually a human shampoo and conditioner that makes your hair grow really fast. It worked on me. You could probaly get it at Target or Walmart maybe even Walgreens or CVS. It can also be used on animals. But the main use is humans. TRUST me it does work. My hair grew very fast. And its hard to get my hair to grow fast.