Ashwagandha is a popular herbal supplement used for stress and sleep, but it is not risk-free. The most common side effects are mild and include stomach upset, diarrhea, and drowsiness. More serious risks exist for specific groups, including pregnant women and people with certain medical conditions, so understanding who should avoid it matters as much as knowing the benefits.
What Are The Side Effects Of Ashwagandha? The Basics
Ashwagandha comes from a shrub native to India and parts of Africa. Its roots and leaves have been used in Ayurvedic medicine for centuries. Modern research has focused on its potential to reduce stress and anxiety, improve sleep, and support physical performance.
The side effects are generally mild when the supplement is taken at recommended doses for short periods. Clinical trials lasting up to three months have reported few adverse events. The most commonly reported issues involve the digestive system.
Gastrointestinal problems are the most frequent complaint. Some people experience nausea, an upset stomach, or loose stools. Diarrhea has been reported in some studies. Taking ashwagandha with food may reduce digestive discomfort, though this is practical advice rather than a proven clinical guideline.
Drowsiness is another documented side effect. Ashwagandha has sedative properties, which is partly why it is used for sleep support. Taking it during the day can make some people feel sleepy or less alert. This effect is more noticeable at higher doses.
Who Should Not Take Ashwagandha?
Pregnant women should not take ashwagandha. Research in animals has shown that high doses can cause miscarriage. No clinical trials have been done in pregnant women, and the potential risk is serious enough that most experts advise complete avoidance during pregnancy.
People with autoimmune diseases should be cautious. Ashwagandha can stimulate immune activity. This is a concern for conditions like rheumatoid arthritis, lupus, and multiple sclerosis, where the immune system is already overactive. The evidence here is theoretical rather than proven in human trials, but the risk is not worth taking without medical supervision.
People with thyroid conditions need to be aware that ashwagandha can increase thyroid hormone levels. Some research indicates it stimulates thyroid function. If you take thyroid medication, ashwagandha could interfere with your dosing. Anyone with hyperthyroidism should avoid it entirely.
People scheduled for surgery should stop taking ashwagandha at least two weeks beforehand. The concern is that it may slow the central nervous system and could interact with anesthesia. This is a precaution based on the herb’s sedative effects rather than a documented interaction in surgical patients.
Can Ashwagandha Interact With Medications?
Yes. Ashwagandha can interact with several common medications. The most significant interactions involve sedatives, thyroid medications, and drugs that suppress the immune system.
Because ashwagandha has sedative properties, combining it with prescription sleep aids, anti-anxiety medications, or certain antidepressants can cause excessive drowsiness. Alcohol amplifies this effect as well. The combination can impair coordination and judgment more than either substance alone.
Thyroid medications require specific attention. Ashwagandha may increase thyroid hormone production. If you take levothyroxine or other thyroid replacement drugs, adding ashwagandha could push your hormone levels too high. Symptoms of excess thyroid hormone include rapid heart rate, anxiety, and unintended weight loss.
Immunosuppressant drugs are another concern. People taking these medications after organ transplants or for autoimmune conditions should not use ashwagandha. The herb’s immune-stimulating effects could work against the medication’s purpose.
Blood pressure and blood sugar medications may also interact with ashwagandha. Some evidence suggests the herb can lower both blood pressure and blood sugar. Combined with prescription medications for these conditions, the effect could be additive and cause levels to drop too low.
What Dose Causes Side Effects?
Side effects appear to be dose-related. Higher doses increase the likelihood of gastrointestinal distress and drowsiness. Most clinical trials have used doses between 300 and 600 milligrams per day, standardized to contain a specific percentage of withanolides, the active compounds.
Doses at the higher end of the studied range are more likely to produce side effects. Some studies have used up to 1,000 milligrams daily, but the benefit of exceeding 600 milligrams is not well established. Taking more does not necessarily mean better results.
There is no official recommended daily allowance for ashwagandha because it is a supplement, not a nutrient. The dose that works for one person may cause problems for another. Body weight, individual sensitivity, and the specific extract formulation all play a role.
No clinical guidelines currently exist for ashwagandha dosing in children. The research has been conducted almost entirely in adults. Giving this supplement to children without medical supervision is not advised.
Are There Long-Term Risks?
Most studies have lasted eight to twelve weeks. The long-term safety profile of ashwagandha is not well understood. No large human trials have followed people taking it for years.
One documented concern is the risk of liver injury. There have been case reports of liver damage in people taking ashwagandha supplements. This appears to be rare, but it is serious. The exact mechanism is unclear, and it is not known whether certain people are more susceptible.
Signs of liver problems include yellowing of the skin or eyes, dark urine, severe fatigue, and unexplained abdominal pain. Anyone experiencing these symptoms while taking ashwagandha should stop and seek medical attention.
The lack of long-term data means the safest approach is to use ashwagandha for defined periods rather than indefinitely. Many practitioners recommend cycling the supplement, such as taking it for a few months and then pausing. This is common practice, but it is not backed by specific clinical research.
What About Ashwagandha Quality and Contamination?
Supplements are not regulated the same way prescription drugs are. The FDA does not review ashwagandha products for safety or effectiveness before they reach store shelves. This means product quality varies significantly between brands.
Some ashwagandha products have been found to contain less of the active compounds than their labels claim. Others may contain contaminants. Choosing a product that has been third-party tested by organizations like USP or NSF provides some assurance of quality, though it does not guarantee safety.
Heavy metal contamination is a particular concern with herbal supplements grown in soil with high metal content. Ashwagandha is a root, and roots can absorb heavy metals from the soil. Reputable manufacturers test for these contaminants, but not all do.
No study has confirmed that any specific brand is safer than others. The best approach is to buy from established companies that provide third-party testing results and clearly state the withanolide content on the label.
When Should You See a Doctor?
Stop taking ashwagandha and consult a healthcare provider if you experience severe side effects. These include persistent vomiting, severe abdominal pain, yellowing of the skin or eyes, or symptoms of an allergic reaction such as difficulty breathing or swelling of the face and throat.
Anyone with an existing medical condition should talk to their doctor before starting ashwagandha. This is especially important for people with liver disease, thyroid disorders, autoimmune conditions, or diabetes. The supplement may affect how your condition responds to treatment.
If you are taking any prescription medication, ask your pharmacist or doctor about potential interactions. Many people do not realize that herbal supplements can interfere with prescription drugs. A quick check can prevent a serious problem.
Frequently Asked Questions
Can ashwagandha cause liver damage?
Rare cases of liver injury have been reported in people taking ashwagandha. The risk appears to be low, but anyone experiencing yellowing skin, dark urine, or severe fatigue should stop taking it and see a doctor.
Is ashwagandha safe to take every day?
Most clinical trials have used ashwagandha daily for up to three months with mild side effects. Long-term daily use has not been studied, so the safest approach is to use it for defined periods rather than indefinitely.
Can ashwagandha cause weight gain?
Weight gain is not a documented side effect of ashwagandha. Some research actually suggests it may help with weight management, but this evidence is limited and not consistent.
Does ashwagandha interact with birth control?
No direct interaction between ashwagandha and birth control has been documented. However, ashwagandha is not recommended during pregnancy, so anyone trying to conceive should discuss its use with their doctor.
