English version in progress: interface and data are in English; some explanatory text is still in Chinese.
Collagen / collagen peptides
不会直接"搬过去"。它先被消化成氨基酸和小肽，身体再按需要合成自己的胶原，这一步需要维生素 C。
Full ranking Dose tool Products (1,023)
Key facts
Daily Value (US FDA)—
Tolerable Upper Intake Level (UL)— Authoritative daily maximum: 10,000 mg
Median（Per day）1,200 mgP5 20 – P95 20,000
Products1,023
Sources: https://webprod.hc-sc.gc.ca/nhpid-bdipsn/atReq?atid=hydrolized.collagen&lang=eng · Health Canada NNHPD monograph: 2.6-10 g hydrolyzed collagen/day
How it works：吃胶原蛋白，会直接变成皮肤里的胶原吗？
- 胶原蛋白在消化道被分解为氨基酸和小肽。
- 研究在人体血液中检测到来自食物的胶原小肽，如脯氨酰-羟脯氨酸（Pro-Hyp）。
- 身体用氨基酸合成自己的胶原蛋白，这一过程需要维生素 C。
Schematic only; positions and scale are not anatomical.
Limits and cautions：口服胶原对皮肤、关节等的作用，研究质量和结论不一。
Sources：Iwai K. et al., J Agric Food Chem 2005: food-derived collagen peptides in human blood；NIH ODS: VitaminC Fact Sheet for Health Professionals
Daily dose across products（mg/day）
Authoritative daily maximum 10,000
2.6 mglog scale · n=1,02322,000 mg
Label data from official national databases and brand websites, as declared; not lab-verified.
Top ranked
| Rank | Brand | Product | Per day | Score |
|---|---|---|---|---|
| 1 | The Vitamin Shoppe | BioCell Collagen II with Hyaluronic Acid | 2,000 mg | 90.0 |
| 1 | Spring Valley | Collagen + C 2500 mg | 2,500 mg | 90.0 |
| 1 | Spring Valley | Collagen 1000 mg | 6,000 mg | 90.0 |
| 1 | Vitamin World | Hydrolyzed Collagen | 8,000 mg | 90.0 |
| 1 | Metamucil | Metamucil Fiber + Collagen Ultra Smooth Orange Flavored | 9,000 mg | 90.0 |
For information only; not medical advice. Talk to a doctor or pharmacist before starting or stopping any supplement.