The cost of shampoo can add up over time, and many of the shampoos on the market today contain ingredients that are not natural and can dry your hair. A homemade shampoo with glycerin will moisturize your hair--glycerin is a humectant, a compound that absorbs and retains moisture. You can make homemade shampoo with glycerin that is unscented and consists of natural products for a fraction of the cost of store-bought shampoos.

Use a cheese grater or food processor to grate a bar of Castile soap until you have ¼ cup.

Pour ¼ cup hot water into a small bowl. Add the grated soap and stir until the soap has dissolved.

Add 2 tablespoons glycerin and ½ teaspoon olive oil. Stir with a spoon to combine the ingredients. Allow the shampoo to cool for a few hours to room temperature before use.

Boil 1 ½ cups water in a small saucepan. Place 4 chamomile tea bags into the pan and let them steep for 10 minutes.

Remove the tea bags and add 4 tablespoons pure soap flakes. Stir the mixture until the soap flakes dissolve.

Add 1 ½ tablespoons glycerin to the mixture. Stir thoroughly to combine. Allow the shampoo to cool for a few hours to room temperature before use.