The absolutely best herbal shampoo and conditioner I have ever tried are MillCreek Biotene H-24 Shampoo , and Aubrey Organics - Island Naturals Replenishing Conditioner.

MillCreek Biotene H-24 Shampoo gives you thicker fuller hair.

Aubrey Organics - Island Naturals Replenishing Conditioner makes your hair incredibly nice and soft, strengthens, and adds a nice exotic, spicy scent.

You can find them at your local Wholefood Market. If there are no Wholefood Markets in your area, visit:

http://www.aubrey-organics.com/product1.cfm?product_id=901

Under Biotin Section-
http://millcreekusa.com/products/hair.html