The fast-acting group
Melatonin (3mg), L-Theanine (200mg), and GABA (100mg) are the fast-acting portion of the formula — supporting circadian signaling and a calm mind as you first settle into bed.
The sustained group
Valerian Root (300mg) and Chamomile (150mg) are more gradual, traditional botanicals associated with supporting overall sleep quality and continuity through the night.
Why disclose exact doses?
Many sleep formulas hide their ingredient amounts behind a vague "proprietary blend." Yu Sleep lists an actual per-serving amount for every ingredient, so you know exactly what you're taking. See the full ingredients page.
What this means for timing
Taking Yu Sleep about 30 minutes before bed gives the fast-acting ingredients time to take effect as you wind down, while the sustained botanicals continue supporting sleep quality overnight.