In the second video, Adele reviews a tip from content creator @Natakochn, who applies glycolic acid to the scalp to lighten oily roots.

Adele notes that glycolic acid can help reduce sebum production on the scalp, which naturally reduces oiliness at the roots. She notes that this ingredient also removes product build-up and exfoliates the scalp. Adele recommends applying the product to the scalp only once a week before shampooing.

Given that everyone has a different tolerance for chemical exfoliants like glycolic acid, start using it once a week for whatever benefit you desire and work your way up if your skin can handle it.

On that note, if you notice any irritation, itching, or sensitivity, stop using the scrub immediately. Glycolic acid isn’t for everyone, and that’s okay! Even if you can usually tolerate an acidic toner, the sensitive skin under your arms or on your scalp may be different. Always listen to what your skin is trying to tell you.