I originally started ashwagandha for stress and sleep. Hormones were not on my radar beyond the general idea that lower cortisol might be helpful. Over the past couple of years, a series of clinical trials and meta-analyses have refined how I think about the herb’s endocrine effects. The picture is more nuanced — and more interesting — than the simple “balances hormones” marketing often suggests.

The product I use is Thorne Ashwagandha, which features the highly concentrated Shoden extract. You can find it here: Thorne Ashwagandha Shoden Extract.

What I Used to Believe

Like many people, I absorbed a mix of traditional claims and early study headlines: ashwagandha “supports healthy testosterone,” “helps thyroid function,” and “balances the stress hormone cortisol.” I treated these as broad, positive effects and didn’t dig into the details of dose, population, or magnitude.

Recent systematic reviews forced me to get more precise.

Cortisol: The Clearest Signal

The strongest and most consistent finding across multiple randomized trials and meta-analyses is a reduction in cortisol. One 2026 systematic review and meta-analysis of 23 trials (over 1,700 participants) found a significant decrease in cortisol with ashwagandha supplementation. This aligns with the herb’s reputation as an adaptogen and with my own experience of lower perceived stress and better recovery from demanding days.

Lower cortisol is not just a stress story. Chronically elevated cortisol can suppress reproductive hormones, disrupt sleep architecture, and influence abdominal fat storage. The cortisol data gave me a clearer mechanism for several of the secondary benefits people report.

Testosterone: Real but Modest and Context-Dependent

Several trials, particularly those using standardized root extracts at around 600 mg per day, have shown increases in total testosterone in men — often in the range of 10–20% depending on the study population. A 2026 meta-analysis reported an average increase of roughly 57 ng/dL in men, with little to no effect in women.

The increase appears more reliable in stressed men, resistance-training men, or those with lower baseline levels. It is far smaller than pharmaceutical testosterone therapy and should not be viewed as a replacement for medical treatment of hypogonadism. Still, the data moved me from “maybe it does something” to “there is a measurable, modest effect in specific contexts.”

You can check the concentrated Shoden formula I use here: Thorne Ashwagandha on Amazon.

Thyroid: A More Cautious Picture

This is the area where my view changed most. Some earlier reports and smaller studies suggested ashwagandha could increase thyroid hormones, especially in people with subclinical hypothyroidism. Newer pooled data show little effect on TSH or T3 and only a modest average increase in T4.

The practical takeaway is two-sided. For someone with low-normal thyroid function the mild upward nudge might be welcome. For anyone already on levothyroxine or dealing with hyperthyroidism, the same effect could require monitoring or avoidance. I now treat thyroid status as a clear reason to involve a doctor rather than an automatic benefit.

Other Hormonal Notes

Serotonin has shown increases in some analyses. Effects on estrogen appear minimal in the available data. DHEA-S results have been mixed across trials. Overall, ashwagandha is not a broad-spectrum “hormone optimizer.” Its most reliable endocrine actions center on the HPA axis (cortisol) with secondary, smaller influences on the HPG axis and thyroid in certain people.

How This Changed My Personal Approach

I still take Thorne’s Shoden ashwagandha most days for stress resilience and sleep support. The hormone data did not make me stop; they made me more precise:

• I pay more attention to how I feel over multi-week periods rather than expecting dramatic hormonal shifts.
• I would get baseline and follow-up labs if I had any thyroid history or symptoms.
• I view any testosterone-related benefit as a possible side effect of better stress management, not the primary goal.
• I remain respectful of the rare but documented liver-related case reports and would stop immediately if unusual fatigue, dark urine, or abdominal symptoms appeared.

Practical Implications for Others

If your main goal is stress and cortisol support, the current evidence is solid. If you are specifically chasing testosterone or thyroid changes, the effects are real but modest and population-dependent — and they warrant medical oversight if you have existing endocrine conditions or take hormone-related medication.

Highly concentrated extracts such as Shoden allow lower capsule counts while still delivering meaningful withanolide levels. That convenience is one reason I continue with the Thorne product.

Final Thoughts

Recent studies and meta-analyses moved my view of ashwagandha and hormones from vague positivity to a clearer hierarchy: strong cortisol data, modest context-dependent testosterone effects in men, and a cautious, individualized approach to thyroid. The herb remains a useful adaptogen in my routine, but I no longer treat it as a general hormone balancer.

If you want to try the same highly concentrated Shoden formula while keeping these research nuances in mind, it is available here: 👉 Check Thorne Ashwagandha Shoden Extract on Amazon.

This is my personal interpretation of published research and experience. It is not medical advice. Hormonal effects vary. Consult a qualified healthcare professional before use, especially if you have thyroid issues, take hormone-related medication, or have other endocrine concerns.

This post contains affiliate links. I may earn a small commission if you make a purchase through these links, at no extra cost to you.