What is the best curling shampoo?

I want to get my hair curly but in a simple way so what shampoo should i use?What is the best curling shampoo?
there is a product a vailable in Hungary. My sister washed her hair and become very curly. It is a nature's product, basic ingredient is Nettle, or stinging Nettle.


She washed first, her hair become slightly bouncy, but after reading the instruction to leave it on for 10 minutes, she rewashed, and had a head full of curls. When sweats, around the temple get little, almost kinky curls.


I will ask her to send me this product.What is the best curling shampoo?
Boil tealeaves and apply the decoction.Then curl your hair.