"Peppermint oil has been shown to increase blood flow to the scalp and may stimulate growth and thicker, stronger hair strands," says Dr. Garshick. She points to a 2014 study conducted in rats ...
Rats don’t like strong scents such as garlic powder or peppermint oil so if you’ve got some vulnerable areas in your garden, it’s worth sprinkling some on the ground to deter them.