Re-Nest writes about ways to re-use that banana peel:

1. Help Your Garden Grow: Bananas are naturally high in potassium and encourages plant growth. Use banana peel or puree entire banana and bury with soil.
2. Shoe Polish: Use the peel to make your kicks nice and shiny.
3. Stop the Itch: Rub the inside of a banana peel on a bug bite helps itch relief.
4. Pain Reliever: The oil in a banana peel will help relieve the pain from burns and scratches.
5. Wart Removal: Tape a piece of banana peel on a wart, continue until it’s gone.
6. Make Houseplants Gleam: Just like peels can shine shoes, they can also be used to make the leaves of plants shine.
7. Removing Splinters: Similar to wart removal, tape a piece of the peel over the splinter. The enzymes will help dislodge the splinter and heal the wound.

While tip #1 sounds reasonable (compost!), #3, #4, #5, and #7 just sounds like old wives tales. Is there any hardcore science behind any of this? I’m too tired to Google.