Cosmetics? Nutritional supplements? No, that's not it. The answer is...

It is shouting.

If you scream, the things accumulated inside your body will fall away.

You know how after we eat, food gets stuck between our teeth and gums, and if we blow air out of our mouths, it comes out?

It is the same principle.

If you look up the recent status of rock singers, you will see that their genes, eating habits, and lifestyles are all different, and while their commonality is that they make a living by belting out songs, their skin is firm and wrinkle-free.

Everyone, please shout a lot.

Ughhh

Aaaargh

Aaaargh

*Cough*

Kyah!