English version in progress: interface and data are in English; some explanatory text is still in Chinese.
Bifidobacterium
多数不会长期定居。它们在通过肠道时与原有菌群互动，效果取决于具体菌株。
Key facts
Daily Value (US FDA)—
Tolerable Upper Intake Level (UL)—
Median（Per day）600,000,000 CFUP5 22,500,000 – P95 10,000,000,000
Products339
Sources: internal: supp.db label distribution (DSLD/LNHPD/NPRA/brand sites), dose_stats s · no authoritative UL; hard_high = max(median x 10^max(2, 5*MAD_log10), 10 x P95); P95=1e+10; median=6e+08 CFU, MAD_log10=0.48
How it works：益生菌吃下去会一直留在肠道里吗？
- 益生菌是活的微生物，标签用 CFU（菌落形成单位）表示数量；到保质期时的数量可能低于生产时。
- 一部分菌在通过胃酸和胆汁时死亡。
- 存活的菌在肠道内与原有菌群互动，多数不会长期定植。
- 可能的作用方式包括产生短链脂肪酸、与病原菌竞争和影响免疫反应；不同菌株差别很大。
Schematic only; positions and scale are not anatomical.
Limits and cautions：效果因菌株而异，不能把一个菌株的研究结果推到另一个菌株；免疫功能严重受损者使用前应咨询医生。
Sources：NIH ODS: Probiotics Fact Sheet for Health Professionals
Daily dose across products（CFU/day）
1,000,000 CFUlog scale · n=33996,000,000,000 CFU
Label data from official national databases and brand websites, as declared; not lab-verified.
For information only; not medical advice. Talk to a doctor or pharmacist before starting or stopping any supplement.