Supplements and hormones
Berberine and Your Hormones: Testosterone, SHBG and PCOS
Reviewed by a qualified clinician · analysed at UKAS-accredited UK labs (ISO 15189)
Last reviewed August 20267 min read
Every Helvy guide is written by our health editors, then checked by a qualified clinician before it goes live and re-checked as the science moves. We name clinical roles, not individuals, until each reviewer has agreed to be credited publicly. This is wellness guidance to help you understand your own data, not a diagnosis.
QUICK ANSWER
Berberine’s clearest hormonal effect in PCOS is on androgens. Pooled trial data show total testosterone falling by about 0.34 nmol/L and SHBG rising, so the free androgen index drops. LH and the LH to FSH ratio fall too. You cannot feel any of that. Test before you start, then again at three months.
Berberine is the most searched supplement in our data by a wide margin. Most of what is written about it covers blood sugar. The hormone side gets far less attention, and it is the side with the neater numbers.
This guide covers what the trials measured, which of those markers you can actually check, and when to check them.
By the Helvy Medical Team · Reviewed by a qualified clinician · 7 min read
As of August 2026. Includes the case-control study published on 22 May 2026 in Frontiers in Endocrinology.
1. What does berberine actually move?
Start with the largest pooled analysis. A 2019 systematic review gathered randomised trials of berberine in women with PCOS. Four hormone results came out of it.
Total testosterone fell by 0.34 nmol/L against placebo or no treatment, across 8 trials and 577 women. SHBG rose by 13.71 across 2 trials and 146 women. In the same two trials the free androgen index fell by 1.30. The LH to FSH ratio fell by 0.44.
Those four move together, and that matters later. Testosterone down and SHBG up both push the free androgen index in the same direction.
A case-control study published in May 2026 points the same way. Sixty women, 500 mg three times a day for three months. Testosterone fell about 27% in the berberine group and did not budge in the control group. LH nearly halved. FSH did not change.
Now the honesty. The 2019 authors said plainly that “most of the studies were of low methodological quality”, and warned that bias “might result in overrating the efficacy of berberine”. The 2026 study was retrospective and small.
So treat the direction as reasonably consistent and the size as uncertain. Which is exactly the case for measuring your own numbers rather than borrowing a trial average.
2. Why is SHBG the marker to watch?
Sex hormone binding globulin is the protein that carries testosterone around your blood. Testosterone bound to SHBG is parked. Only the unbound share is free to act on skin and hair follicles.
That is why SHBG changes how a testosterone result should be read. NHS Borders guidance for clinicians puts the point directly.
“The FAI is more sensitive at detecting hyperandrogenism than total testosterone.”
— NHS Borders, Polycystic Ovary Syndrome guidance
The same guidance notes that SHBG runs low in PCOS, in insulin resistance and in obesity. Low SHBG means more active testosterone from the same total.
The free androgen index is the sum that ties the two together. It is total testosterone divided by SHBG, times 100. Our free androgen index guide walks through how to read one.
Here is the practical upshot. A supplement that raises SHBG can lower your free androgen index even if total testosterone barely shifts. Test total testosterone on its own and you may miss the change entirely.
3. Which five markers are worth measuring?
These are the hormones the berberine trials tracked, and the ones UK pathways use when androgen excess is the question.
TOTAL TESTOSTERONE
The headline androgen, and the marker with the most trial data behind it. NHS Borders adds a useful flag: a result above 4 nmol/L is unusual in PCOS and should be repeated. Our Hormone Balance panel (£99) measures it.
SHBG
The carrier protein above. It is the marker that rose in the pooled trials, and the one you cannot infer from anything else. Hormone Balance (£99) measures SHBG.
FREE ANDROGEN INDEX
A calculation, not a separate sample. It fell by 1.30 in the pooled placebo comparison. Hormone Balance (£99) reports the free androgen index.
LH AND FSH
LH fell in both the pooled data and the 2026 study, while FSH held steady. NHS Borders notes LH is often normal in PCOS and is not needed for diagnosis, so read it as a trend, not a verdict. Hormone Balance (£99) measures both.
One boundary matters. A blood test measures hormones. It does not diagnose PCOS. That needs a clinician weighing your symptoms, your cycle and often a scan, as our PCOS blood test guide explains.
For the wider picture, start at the women’s hormones hub.
4. When should you test, and what about safety?
Timing changes the answer. NHS Borders advises taking the sample on days 1 to 5 of your cycle unless your periods have stopped. The reason is blunt: testosterone production roughly doubles in the early follicular phase.
So test in the same window both times. A before reading on day 3 and an after reading on day 20 tells you about your cycle, not your supplement.
On the interval, three months is the floor. Both the pooled trials and the 2026 study ran for three months or longer. Retesting at six weeks mostly buys you noise.
Doses in the hormone trials clustered around 500 mg two or three times a day, taken with food. Gut upset is the common complaint.
The liver worry is worth putting in proportion. The NIH LiverTox database gives berberine a likelihood score of E, its lowest tier, meaning an unlikely cause of clinically apparent liver injury. It adds that berberine “has not been linked to serum enzyme elevations during therapy”.
The real caution is interactions. Berberine affects the liver enzymes that clear many prescription medicines, so levels of those medicines can shift. If you take anything regularly, ask your pharmacist before you start. Avoid it in pregnancy and while breastfeeding. If you want your liver markers on record anyway, ALT and ALP sit in our Thyroid & Vital Organs panel (£159).
The glucose side of berberine is a separate question with its own evidence. We cover it in the berberine and blood sugar guide.
5. Frequently asked questions
Does berberine lower testosterone?
In women with PCOS, pooled trial data show total testosterone falling by about 0.34 nmol/L against placebo or no treatment. The trials behind that figure were graded low quality, so the direction is more reliable than the size.
Does berberine raise SHBG?
Two placebo-controlled trials totalling 146 women found SHBG rose by 13.71 on berberine. That is the change you cannot feel, and the reason a before and after test is the only way to know.
Is there evidence in men?
Almost none. The hormone trials were run in women with PCOS. Reading a PCOS result across to a man is a guess, not evidence.
Berberine or inositol for PCOS?
One randomised study put berberine, myo-inositol and metformin head to head in 129 women. All three lowered testosterone and the free androgen index, and raised SHBG. No clear winner emerged on androgens. See our inositol guide for that side.
Which blood test should I get before starting berberine?
The five the trials tracked are total testosterone, SHBG, the free androgen index, LH and FSH. Our Hormone Balance panel (£99) measures all five. Take the sample on days 1 to 5 of your cycle, and repeat in the same window at three months.
KNOW YOUR STARTING NUMBERS
Measure before you supplement
Our Hormone Balance panel (£99) measures FSH, LH, SHBG, total testosterone and the free androgen index. Home finger-prick kit, results in about 5 working days, from UKAS-accredited UK laboratories.
Medical disclaimer:This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment. The studies cited measure population-level effects and may not predict an individual response. Do not start, stop or change any supplement or medicine based solely on this article — consult your GP, pharmacist or a qualified healthcare professional. All Helvy blood tests are processed by UKAS-accredited UK laboratories to ISO 15189.
Last updated: August 2026 · By Helvy · Medically analysed at UKAS-accredited UK laboratories
RELATED READING