Speaking of miracle products, I started using a terrific soap made from olive oil, called castile soap. The brand is Dr. Bronner's. It can be used as soap, shampoo, household cleaning fluid... even supposedly polishing leather. It's a little expensive, at ~$14 for 32 oz, but it can be diluted too.
I used to wash my hair with shampoo, but then once I stopped for a few days, and my hair looked full and lush. Then I started using just a tiny drop of shampoo or nothing at all, to keep my hair feeling full. Now I use the castile soap, and it cleans the hair without making it thin and flat like modern shampoos do.
For some reason, the last two people to cut my hair were visibly annoyed by the thickness of my hair, and proceeded to manhandle me for it...
Seems like there's a lot of simple natural remedies that are just plain better than the mainstream choice. No stupid marketing, no chemicals, no excessive profits...