The Claim

In a mouse model of dihydrotestosterone (DHT)-induced polycystic ovary syndrome (PCOS), daily oral administration of the probiotic strain BL21 at a dose of 1 × 10⁹ colony-forming units (CFU) for 8 weeks was associated with increased serum levels of follicle-stimulating hormone (FSH) and estradiol (E2), and decreased levels of testosterone and luteinizing hormone (LH), suggesting a potential role for BL21 in restoring hormonal balance linked to improved ovarian function.

Source: Modulatory impact of Bifidobacterium longum subsp. longum BL21 on the gut–brain–ovary axis in polycystic ovary syndrome: insights into metabolic regulation, inflammation mitigation, and neuroprotection

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
11score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Correlation
1 study reviewed
In plain English

Giving a certain probiotic to mice with a condition like PCOS helped balance their hormones — boosting some that help with egg release and lowering others that are too high — which might mean their ovaries started working better.

See the scientific wording

In a mouse model of DHT-induced PCOS, 8 weeks of daily oral BL21 supplementation at 1 × 10⁹ CFU was associated with increased serum levels of follicle-stimulating hormone (FSH) and estradiol (E2), and decreased testosterone and luteinizing hormone (LH), indicating a potential role in restoring hormonal balance characteristic of improved ovarian function.

What the research says

1 study
  1. Study: Modulatory impact of Bifidobacterium longum subsp. longum BL21 on the gut–brain–ovary axis in polycystic ovary syndrome: insights into metabolic regulation, inflammation mitigation, and neuroprotection

    The study gave a specific probiotic to mice with a condition like PCOS and found it improved key hormones involved in reproduction, which supports the idea that it helps balance hormones.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

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