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Commonly discussed for Sleep4

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Rest quality and how easily you wind down.

CaffeineCompound

A stimulant found in tea, coffee, and cacao. One of the most studied compounds; commonly discussed in relation to alertness, and — when taken later in the day — sleep.

Commonly discussed forFocus Sleep

Established research area

GlycineCompound

A small amino acid abundant in collagen. Often discussed in relation to sleep quality and skin.

Commonly discussed forHair and nails Skin Sleep

Emerging research

L-TheanineCompound

An amino acid found mainly in tea leaves. Often discussed in relation to calm focus, especially alongside caffeine.

Commonly discussed forFocus Sleep Stress and mood

Emerging research

ApigeninCompound

A plant flavonoid found in parsley, celery, and chamomile.

Commonly discussed forSleep Stress and mood

Limited research so far