You started taking ashwagandha to manage stress—and now you're wondering if it's affecting your weight.
It's one of the most common questions people ask about this ancient adaptogenic herb.
The short answer is: Ashwagandha is unlikely to cause weight gain directly.
But the full picture is more nuanced, and understanding how it works can help you use it more effectively.
What Is Ashwagandha?
For thousands of years, Ayurvedic medicine has utilized the adaptogenic herb ashwagandha (Withania somnifera).
Its active compounds, called withanolides, are responsible for most of its health effects.
It is best known for reducing stress, improving energy, and supporting hormonal balance.
Does Ashwagandha Cause Weight Gain?
Ashwagandha does not directly cause fat gain.
However, some users report weight changes after starting it — and there are a few reasons why.
When you are chronically stressed, your body produces high levels of cortisol.
When cortisol levels are high, your body stores fat, particularly around the stomach.
Clinical research has demonstrated that ashwagandha dramatically reduces cortisol levels.
As cortisol drops, your metabolism and body composition can shift.
For some people, reduced stress also means improved sleep and better appetite regulation.
This combination can lead to either weight loss or a redistribution of body fat — not gain.
Does Ashwagandha Increase Weight in Females?
When using ashwagandha, some women experience slight weight swings.
This is frequently linked to how it affects the balance of estrogen and thyroid hormones.
It has been demonstrated that ashwagandha promotes thyroid function, which has a direct impact on metabolism (1).
Women with underactive thyroids may notice a positive shift in energy and weight regulation.
Water retention during hormonal adjustment is also a temporary possibility.
This is not true weight gain — it typically resolves within the first few weeks.
Ashwagandha for Weight Loss: What Studies Show
According to a 2019 study that was published in Medicine, giving ashwagandha to people who were under chronic stress considerably decreased their body weight, BMI, and food cravings (2).
For eight weeks, participants consumed 240–300 mg of standardized ashwagandha extract every day.
The ashwagandha-taking group experienced a statistically significant drop in body weight as compared to the placebo group.
This was partially explained by lower cortisol levels and better mental health, according to researchers (3).
Ashwagandha for Athletes: Pros and Cons
Athletes often use ashwagandha to boost performance, endurance, and recovery.
Studies show it can increase muscle strength and size when combined with resistance training (4).
This means some users may see a slight increase on the scale due to muscle gain, not fat gain.
Muscle is denser than fat, so body composition improves even if weight stays the same or increases slightly.
The primary drawback for athletes is that some people may have slight gastrointestinal distress when using ashwagandha.
Best Time to Take Ashwagandha
Most studies use doses of 300–600 mg of root extract daily.
Taking it in the morning can help regulate cortisol throughout the day.
Taking it at night may improve sleep quality and overnight recovery.
Consistency matters more than timing—daily use over 8 weeks yields the most noticeable results.
Side Effects to Know
Adults in good health typically tolerate ashwagandha well.
Mild nausea, upset stomach, or tiredness are possible adverse effects.
Because it may increase immunological activity, it is not advised for those with autoimmune disorders.
Without medical advice, women who are nursing or pregnant should stay away from it.
Final Thoughts
Ashwagandha is unlikely to be the reason your jeans feel tighter.
In fact, most of the evidence points in the opposite direction—toward better body composition over time.
If you are using it consistently and eating well, ashwagandha can be a powerful tool for managing stress and supporting a healthy weight.
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FAQs
Does ashwagandha increase body weight?
Not directly. Any change in weight is typically linked to muscular growth, a drop in cortisol, or temporary water retention rather than fat gain.
How does ashwagandha affect your weight?
By lowering cortisol, enhancing sleep, and decreasing stress-related food cravings, it may promote healthy weight management.
Can acne be brought on by ashwagandha?
Rarely, ashwagandha's hormonal alterations may cause breakouts, especially in those who are sensitive to androgen fluctuations.
What are ashwagandha's most common adverse effects?
The most frequent ones are sleepiness, minor gastrointestinal distress, and, in rare instances, liver sensitivity at extremely high dosages.
Related Studies
1. Title: Body Weight Management in Adults Under Chronic Stress Through Treatment With Ashwagandha Root Extract: A Double-Blind, Randomized, Placebo-Controlled Trial
Summary: An 8-week RCT of 52 stressed adults showing ashwagandha (300 mg twice daily) significantly reduced body weight (8.46 kg), BMI (3.31 kg/m²), and food cravings vs. placebo.
Link: https://pubmed.ncbi.nlm.nih.gov/27055824/
2. Title: A standardized Ashwagandha root extract alleviates stress, anxiety, and improves quality of life in healthy adults by modulating stress hormones: Results from a randomized, double-blind, placebo-controlled study
Summary: A 60-day RCT demonstrating ashwagandha extract significantly reduced morning salivary cortisol and serum cortisol levels compared to placebo in adults with mild-to-moderate stress.
Link: https://pubmed.ncbi.nlm.nih.gov/37832082/
3. Title: Examining the effect of Withania somnifera supplementation on muscle strength and recovery: a randomized controlled trial
Summary: An 8-week RCT showing men taking ashwagandha during resistance training had significantly greater increases in bench press (46.0 kg vs 26.4 kg), leg extension strength, and muscle size vs. placebo.
Link: https://pubmed.ncbi.nlm.nih.gov/26609282/
4. Title: Efficacy and Safety of Ashwagandha Root Extract in Subclinical Hypothyroid Patients: A Double-Blind, Randomized Placebo-Controlled Trial
Summary: An 8-week study of 50 subclinical hypothyroid patients showing ashwagandha (600 mg daily) significantly improved T3 (41.5% increase), T4 (19.6% increase), and reduced TSH vs. placebo.
Link: https://pubmed.ncbi.nlm.nih.gov/28829155/
