Does Ashwagandha Affect Your Thyroid or Liver?
Medical disclaimer: This article is for informational purposes only and is not medical advice. Individual results vary. Consult a healthcare professional before starting any supplement, especially if you take other medications or have a liver, kidney, heart, or thyroid condition. Statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.
Ashwagandha has moved from traditional Ayurvedic medicine into mainstream weight-management and stress-support supplements, often marketed for lowering cortisol and reducing stress-related weight gain. It’s generally well tolerated, but NIH’s LiverTox database documents a specific, if uncommon, pattern of liver and thyroid effects worth knowing about before daily use.
Quick Answer
In documented case reports, ashwagandha has caused liver injury (most often a cholestatic or mixed pattern, with jaundice and itching) typically appearing 2 to 12 weeks after starting use, at doses ranging from standard 150–600 mg servings up to high-dose regimens of 2,100 mg/day. Separately, at least one detailed case describes a woman developing thyrotoxicosis (an overactive thyroid) within six weeks of starting ashwagandha, which resolved after she stopped taking it.
The Liver Injury Pattern
LiverTox describes ashwagandha-associated liver injury as typically cholestatic or mixed in pattern, presenting with jaundice and itching (pruritus), though hepatocellular cases also occur. Most cases are mild to moderate and resolve within 1–4 months of stopping the supplement, but protracted jaundice is common during recovery, and rare fatal cases requiring emergency transplant have occurred, particularly in people with pre-existing cirrhosis or other liver disease. Withanolides, ashwagandha’s active compounds, are the suspected but not definitively confirmed cause.
The Thyroid Connection
Ashwagandha is sometimes marketed as supporting healthy thyroid function, and some small studies do show it can raise thyroid hormone levels in people with low-normal thyroid function. That same property is a risk for people who already have an overactive thyroid or are otherwise sensitive to thyroid hormone shifts: one documented case describes a 32-year-old woman who developed poor appetite, unintended weight loss, shakiness, and heart palpitations, with lab-confirmed thyrotoxicosis, about six weeks after starting ashwagandha. Her symptoms resolved after discontinuation.
Who Should Be Cautious
Anyone with an existing liver condition, a diagnosed thyroid disorder (especially hyperthyroidism or Graves’ disease), or who is on thyroid medication should talk to a doctor before starting ashwagandha. Watch for unexplained fatigue, yellowing skin or eyes, unexplained weight change, rapid heartbeat, or tremor, and stop use if any appear.
Bottom Line
Ashwagandha is broadly well tolerated for most people, but it is not risk-free for the liver or thyroid. The documented cases are uncommon, but specific and government-tracked, enough that anyone with existing liver or thyroid conditions should treat it as a supplement to discuss with a doctor, not a default stress-relief add-on.
Frequently Asked Questions
Q: Does everyone who takes ashwagandha get liver or thyroid problems?
A: No, these reactions are documented but uncommon relative to how widely ashwagandha is used. They’re worth knowing about, not a reason for panic.
Q: Is a higher dose definitely more dangerous?
A: Case reports span both standard and high doses, so while higher, prolonged use may raise risk, standard doses have also been implicated. Individual sensitivity appears to matter.
Related Reading
- Can You Take Ashwagandha and Melatonin Together?
- Can Garcinia Cambogia Cause Liver Damage?
- Supplement Safety & Recalls: Recent FDA and Health Canada Actions