Follicle-Stimulating Hormone (FSH)

No risk curve catalogued yet.

FSH by age and sex

Each bar runs from the 5th to the 95th percentile, the darker part from the 25th to the 75th, and the tick is the median. Not a reference range or a target.

The percentiles as a table

Each row is one sex and age band: the values below which 5%, 25%, 50%, 75% and 95% of people fall (IU/L), from the survey named in the row. Not a reference range or a target.
Sex	Age	5th	25th	Median	75th	95th	n	Cycle / source
Women	35-39	1.94	3.97	5.82	7.62	24.7	353	NHANES 1999-2002
Women	40-59	3.21	6.90	20.2	56.8	92.6	1,283	NHANES 1999-2002
Women	60	17.8	35.6	54.4	79.0	99.5	75	NHANES 1999-2002
Women	all	2.59	5.69	12.4	50.3	89.4	1,711	NHANES 1999-2002

What studies found when this marker was changed

They describe what happened in those study groups, not a recommendation. See all catalogued interventions.

Measured changes in FSH, study by study

3 effects with a numeric size, each from one study arm: the dot is the reported change, the line its 95% interval where one was given. Study results in the groups studied, not predictions for a person.

Each row is one study: what was changed, the effect it reported on this marker, and the source.
Type	Intervention	Reported effect	Evidence	Source
nutraceutical	Soy isoflavones, median 75 mg/day for a median of 24 weeks, in postmenopausal women (40 RCTs)	No effect on FSH: MD -0.02 IU/L (95% CI -2.39 to 2.35)	meta-analysis	Viscardi G, et al. Adv Nutr. 2025. Effect of Soy Isoflavones on Measures of…
nutraceutical	Combined black cohosh, soy isoflavone and flaxseed SDG lignan supplement daily for 90 days in postmenopausal women	FSH -6.7% difference vs placebo at 90 days (estradiol +12.6%)	RCT	Pokushalov E, et al. Eur J Nutr. 2025. Assessing the combined effects of Black…
pharmacologic	Neurokinin 3 receptor antagonist fezolinetant 180 mg/day for 12 weeks in women with PCOS	Adjusted mean FSH change -1.46 IU/L (SE 0.32) vs -0.57 IU/L with placebo at 12 weeks (P = .03)	RCT	Fraser GL, et al. J Clin Endocrinol Metab. 2021. Randomized Controlled Trial of…

Sources

See the catalogue entry in the research dashboard.