What Ingredients are in Hair Products?

It depends on what products you want.
Here's a recipe for shampoo... I haven't tried it yet, but then I only just found it the other day.

Chamomile Fields Shampoo
By: Pioneer Thinking
The Ingredients
4 bags of Chamomile tea (or 1 handful of fresh Chamomile flowers)
4 tablespoons pure soap flakes

1 1/2 tablespoons glycerin*
The Instructions
Let the tea bags steep in 1 1/2 cups of boiled water for 10 minutes. Remove the tea bags and with the remaining liquid add the soap flakes. Let stand until the soap softens. Stir in glycerin until mixture is well blended. Pour into a bottle. Keep in a dark, cool place.