swear by

Those who swear by the ingredient say it’s a natural moisturizer with several benefits, including fighting acne — asserting it has anti-inflammatory properties — and protecting the skin barrier to lock in hydration.

While some people swear by their lucky numbers, there is little rhyme or reason behind purchasing a winning ticket.

"If the crust starts to get too dark, I swear by a ring of foil wrapped around the crust to protect it. You can keep them and reuse them many times too."

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.