English version in progress: interface and data are in English; some explanatory text is still in Chinese.
Melatonin
不是。它是大脑在天黑时分泌的"夜晚信号"，告诉身体现在是晚上，而不是直接让人睡着。
Full ranking Dose tool Products (534)
Key facts
Daily Value (US FDA)—
Tolerable Upper Intake Level (UL)— Authoritative daily maximum: 10 mg
Median（Per day）3 mgP5 0.5 – P95 10
Products534
Sources: https://webprod.hc-sc.gc.ca/nhpid-bdipsn/atReq?atid=melatonin.oral2&lang=eng · Health Canada NNHPD monograph: 0.1-10 mg melatonin/day (oral, adults)
How it works：褪黑素是"安眠药"吗？
- 光线抑制褪黑素分泌，黑暗时分泌增加。
- 松果体在夜间分泌褪黑素进入血液。
- 褪黑素作用于 MT1、MT2 受体。
- 它向身体传递"现在是夜晚"的信号，参与调节昼夜节律。
Schematic only; positions and scale are not anatomical.
Limits and cautions：加拿大天然保健品专论允许的成人口服剂量为 0.1–10 mg/天；儿童使用应先咨询医生。
Sources：NCCIH: Melatonin: What You Need To Know；Health Canada NNHPD Monograph: Melatonin (oral)
Daily dose across products（mg/day）
Authoritative daily maximum 10
0.3 mglog scale · n=53412 mg
Label data from official national databases and brand websites, as declared; not lab-verified.
Top ranked
| Rank | Brand | Product | Per day | Score |
|---|---|---|---|---|
| 1 | Vitamin World | Chewable Melatonin 3 mg | 9 mg | 90.0 |
| 1 | Spring Valley | Fast Acting Liquid Melatonin 5 mg Natural Citrus Flavor | 5 mg | 90.0 |
| 1 | XYMOGEN | Melatonin | 3 mg | 90.0 |
| 1 | Nature Made | Melatonin 3 mg With L-Theanine | 3 mg | 90.0 |
| 1 | XYMOGEN | Melatonin CR | 5 mg | 90.0 |
For information only; not medical advice. Talk to a doctor or pharmacist before starting or stopping any supplement.