I came across this Youtube video: The Hair Loss DHT Myth: Baldness Cure Debunked

https://www.youtube.com/watch?v=taMu2UOYQmY

This chap was saying that DHT is a myth, pharma is lying, and he offers a solution.

Is DHT causing baldness REALLY a myth?

I know that harmful chemicals in shampoos can be bad for hair.

But how useful would a shampoo be for hair regrowth? Or would something which is taken orally be more effective?