swear by

Many athletes swear by it, including Michael Phelps and Olympic gymnast Alex Naddour.

For those people, many on Reddit swear by the “gray rock” method.

There are posters who swear by headbands,highlights, lowlights or stripping — processes that replace your current color with your natural one by matching the shade of your roots or removing dye.

Many influencers, athletes, and regular folks swear by ketogenic diets—skimping on carbs and feasting on fats to quickly shed pounds and improve their metabolism.

“I also swear by hardwood floors with inexpensive area rugs versus wall-to-wall carpet with animals. Then, you can wash or replace the area rugs as needed and keep everything clean.”