Scoop out the seeds from the papaya and rinse them in a strainer. Make sure to remove any remaining pulp.
Lay the seeds onto a tea towel and place them somewhere to dry. Outdoors in the sun would be best! If you have a dehydrator, you can also place the seeds in the dehydrator to dry.
Once the seeds have dried, it's time to turn them into powder! You can break up the seeds either by using a mortar and pestle or by grinding them in a cover or spice grinder.
Add the papaya seeds powder to your favorite shampoo (preferably a natural shampoo) and shake the bottle well. Wash your hair as you normally would. Be sure to shake the bottle up before every use as the powder might settle at the bottom.