Surprising

Probiotics raised SHBG by 24 nmol/L in PCOS women — but didn't budge their symptoms or testosterone

This is the first RCT to show Bifidobacterium longum can shift a key hormone-binding protein in PCOS, but the lack of symptom improvement means the clinical relevance is still uncertain — and the effect may not apply outside this specific patient group.

In an 8-week double-blind trial, 90 women with PCOS who took a probiotic blend saw their sex hormone-binding globulin (SHBG) spike by about 24 nmol/L more than placebo, which should theoretically mop up excess free testosterone. Yet total testosterone and actual PCOS symptoms like hirsutism didn't improve, so the hormonal shift didn't translate into real-world relief. The result is intriguing but preliminary, and only applies to women with PCOS.

Where this fits in the evidence

This is among the first studies we've indexed on bifidobacterium longum for Increased Sex Hormone-Binding Globulin Level — treat it as an early signal until more research accumulates.

The study

Effects of supplementation with two probiotic strains (Lactobacillus helveticus and Bifidobacterium longum) on hormonal status, oxidative stress, and clinical symptoms in women with polycystic ovary syndrome: a randomized clinical trial.

Randomized Controlled Trial (RCT)
n = 90
2025-11-18
Nutrition journal

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