Three trials, five reportsMixed evidence
We found three randomised trials of yoga in PCOS, reported in five papers. A 2026 review that searched six databases up to 21 January 2024 found five reports of randomised trials, three of them from one Indian trial in 90 girls aged 15 to 18; the others were 31 women in the US (22 finished) and 61 women in Iran. The trials were too different to combine, and none reported side effects.
Another 2026 review, searching to January 2025, counted 9 randomised trials, four of them from one research group, and couldn't combine them either. Earlier reviews reached positive conclusions from few, small studies: one pooled only 2 trials and rated the strength of evidence "low".
Sources 3, 15, 7, 4, 5, 6, 16, 17, 18
Insulin and blood sugarMixed evidence
In the Indian trial, fasting insulin, fasting blood sugar and insulin resistance improved more with yoga than with matching physical exercise, "independent of anthropometric changes" (without weight change). A meta-analysis of 2 trials found lower fasting insulin, with "low" strength of evidence. Two network meta-analyses ranked yoga or mind-body exercise first for insulin resistance (19 and 29 trials), but the yoga results rest on 3 to 5 small trials, mostly reports of the same Indian trial, and the certainty was low or very low.
Sources 7, 17, 8, 9
Hormones, hair and skinMixed evidence
In the Indian trial, testosterone, anti-Müllerian hormone (AMH, made by the ovaries), luteinising hormone and a hair growth score fell more with yoga than with exercise. Free testosterone fell from 5.96 to 4.24 pg/mL in the 13 US women who finished the yoga group, and hair growth scores and waist size fell after 6 weeks in Iran.
But the 2026 review found the changes in testosterone and AMH statistically unclear, and a network of 19 trials found that exercise of any kind had no effect on sex hormones. Small changes are possible; yoga isn't a treatment for excess hair or acne.
Sources 4, 5, 6, 3, 10
PeriodsMixed evidence
Periods came a little more often with yoga in the Indian trial, and a meta-analysis of 2 trials found less menstrual irregularity, but a network of 19 trials found exercise had no effect on regular periods. Don't rely on yoga to regulate your periods.
Sources 4, 17, 10
Weight and waistMixed evidence
Weight and body mass index (BMI) changed no more with yoga than with exercise in the Indian trial, and moderate aerobic exercise lowered BMI more than yoga in a network analysis. Waist and hip measurements fell in the 6-week Iranian trial.
Sources 4, 10, 6
MoodMixed evidence
In the Indian trial, trait anxiety (how anxious you tend to feel in general) improved more with yoga than with exercise. A network analysis found no clear effect of mind-body exercise on anxiety or depression, from 3 small studies. The guideline asks for everyone with PCOS to be checked for depression, and adults for anxiety.
Sources 15, 9, 1
What the guideline says about exerciseStrong evidence
Adults should aim for 150 to 300 minutes of moderate activity or 75 to 150 minutes of vigorous activity a week, plus muscle-strengthening activities on 2 non-consecutive days, and limit sitting. For modest weight loss, it suggests at least 250 minutes of moderate activity a week; teenagers, at least 60 minutes a day. It finds "a lack of evidence supporting any 1 type and intensity of exercise being better than another". Yoga isn't named in its recommendations. Exercise and Sports Science Australia's position statement says the same.
Sources 1, 19
FertilityMixed evidence
We found no peer-reviewed trial that tested whether yoga improves the chance of pregnancy in PCOS; the only trial in our search was a preprint. The Iranian trial was in women having fertility treatment, and it measured hair growth and waist size, not pregnancies.
Sources 20, 6