By the Ancient Nutra Editorial Team

Search for herbs and hormones and you will be told, confidently, that two roots can put an irregular cycle back on schedule. Ashwagandha and Shatavari are the two names that come up most. Both are real herbs with real research behind them. Neither has research showing what that promise claims. The gap between what these roots have been studied for and what they get sold for is wide enough to be worth walking through slowly, because the honest answer is more useful than the confident one, and it points somewhere different.

An adaptogen is a plant compound that acts on the body's stress-response system rather than on one organ. In practice that means it works on the hormonal chain that runs from the brain to the adrenal glands, the one that governs cortisol. It does not add energy the way caffeine does, and it does not act directly on the ovaries or the uterus. That distinction is the whole reason the cycle claim is shakier than it sounds.

Follow the chain from stress to ovulation

The reasoning behind the cycle claim is not nonsense, which is exactly why it spreads. It goes like this. Sustained high cortisol suppresses the release of gonadotropin-releasing hormone in the brain. That hormone drives luteinising hormone and follicle-stimulating hormone, and those two run ovulation. Lower the cortisol pressure, the argument goes, and the ovulation signal comes back. Every link in that chain is real physiology, documented in textbooks.

The problem is the last step. A plausible mechanism is a hypothesis, not a result. To show that an adaptogen makes cycles more regular, you would need a trial that recruited women with irregular cycles, gave half of them the herb, and then counted cycle days over several months. That trial has not been done for either herb. What exists instead is mechanistic reasoning plus isolated case reports, and a case report is one person with no comparison group.

This is the ordinary shape of supplement evidence. A herb gets studied carefully for one thing, shows a signal, and then the marketing quietly widens to everything the mechanism might touch. For how the stress system itself responds to adaptogens, Ancient Nutra has already covered the mechanism in detail in how adaptogens work without acting like stimulants. The question here is narrower: what were these two roots actually tested on.

Read what the Shatavari trial measured

Shatavari, known in Sinhala as Hathawariya, has one recent trial worth taking seriously. Published in the International Journal of Women's Health in 2025, it randomised 80 women aged 40 to 55 with perimenopausal symptoms, with 73 completing the study. They took 300 mg of a standardised root extract once a day for 8 weeks. The primary measure was the change in total Menopause Rating Scale score, a questionnaire that asks women to rate their own symptoms.

The results were consistent. The Shatavari group improved across all Menopause Rating Scale domains, with reductions in hot flushes, perceived stress and fatigue, and a rise in reported vigour. No adverse events were reported during the study, and liver and kidney function stayed normal.

Read that carefully, because the detail that matters is what was counted. This was a perimenopause symptom trial. It measured how women rated their weeks, not whether their cycles became more predictable. Perimenopause is the stage where cycles become irregular by definition, and the trial did not set out to regularise them. It is also a single study of 73 women over 8 weeks. One trial is a signal worth having, not a settled fact, and 8 weeks is the longest period anyone has tested.

Put Ashwagandha back in its real lane

Ashwagandha has been studied more than almost any other Ayurvedic herb, and the findings point somewhere specific. The US National Center for Complementary and Integrative Health summarises it plainly: some preparations may be effective for insomnia and stress, the evidence on anxiety is unclear, and there is not enough evidence to determine whether it helps any other condition. Female fertility sits inside that second group.

So Ashwagandha is a sleep and stress herb with a long traditional record, not a cycle treatment. That is not a small thing. If stress is genuinely breaking your sleep, and broken sleep is making everything else harder to manage, that is the lane where the herb has support behind it. Ancient Nutra's Ashwagandha capsules and its evening blend both sit in that lane. Neither belongs in a plan aimed at the cycle itself.

Take the liver signal and the pregnancy rule seriously

Ashwagandha carries a documented safety signal that rarely makes it into a hormone-balance post. NIH LiverTox gives Withania somnifera a likelihood score of B, a likely cause of clinically apparent liver injury. The reported cases usually appear 2 to 12 weeks after starting, with a cholestatic or mixed pattern, jaundice and itching. The cases are rare against how widely the herb is used, and they are documented well enough that the window deserves respect.

That window is why Ancient Nutra's own guidance is a bounded course rather than an open-ended habit. It is recommended to take a 1-week break after every 8 to 12 weeks of continuous use. Stop and speak to a doctor if you notice yellowing of the eyes or skin, dark urine, persistent itching or unusual tiredness.

Four groups should not take Ashwagandha at all without medical advice. It should be avoided during pregnancy and while breastfeeding. It is not recommended for people with thyroid or autoimmune conditions, or before surgery. It can add to the effect of sedatives, and it may work against immunosuppressant medication. For a cycle article this matters more than usual, because some readers are trying to conceive.

Shatavari's file is thinner than most people assume. It has no LiverTox monograph at all, which means it has not been assessed rather than that it has been cleared. The 8 week trial reported no adverse events, which is reassuring for 8 weeks and silent about month six. Keep it bounded too.

The bottom line

If your cycle is irregular, that is a reason to get it looked at, not a reason to self-treat. Irregular bleeding has causes worth identifying, including thyroid disease and polycystic ovary syndrome, and no herb substitutes for that. Where these roots have earned their place is the layer around the cycle rather than the cycle itself: the sleep, the stress load, the symptoms of the perimenopausal years. Buy them for what has been tested, keep the course bounded, and let the claim match the evidence.

Moon Milk Powder 100g

An evening drink built on Ashwagandha and warming spices, for winding down before bed. Not for use in pregnancy or breastfeeding.

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Sources and further reading

• Ashwagandha, NIH LiverTox, National Institute of Diabetes and Digestive and Kidney Diseases.
• Ashwagandha: What You Need To Know, National Center for Complementary and Integrative Health.
• Mahajan S, Avad P, Langade J. Efficacy and Safety of Shatavari (Asparagus racemosus) Root Extract for Perimenopause. International Journal of Women's Health. 2025;17:4057 to 4073, PubMed.

Written by the Ancient Nutra Wellness Team. The team researches, sources, and tests every ingredient before it earns a place in an Ancient Nutra blend. Questions? Email info@ancientnutra.com or message Ancient Nutra on Instagram.

Medical disclaimer: This article is for educational purposes only and is not medical advice. Statements have not been evaluated by the FDA. Ancient Nutra products are not intended to diagnose, treat, cure, or prevent any disease. Speak with a qualified healthcare provider before starting any new supplement, especially if you take prescription medication or have a medical condition.