Jarrow Formulas L-Tryptophan provides 500 mg of this amino acid; take on an empty stomach 30 minutes before bed.

Nature’s Way Chamomile Flowers capsules contain 350 mg of dried chamomile buds. NutriCology ZenMind recommends two capsules daily between meals, which provide 550 mg GABA and 200 mg L-theanine per dose.

Solgar 10 mg Liquid Melatonin comes with an eyedropper so you can easily take 5–10 mg (or less) before bed.