Ashwagandha (Withania somnifera)
Indian ginseng, Winter cherry, KSM-66, Sensoril
Forms: Root extracts standardized to withanolides (best studied) and root powder; extracts containing leaves differ in composition.
An Ayurvedic herb sold as an 'adaptogen' for stress. Small trials show less stress and better sleep; rare but real liver injury and thyroid effects have been reported.
Legal status: Sold as a supplement in most countries, but Denmark has banned it in food supplements and Dutch authorities advise against it; varies by country.
What it gives
What people use it for and what the sources report. Strength is a general category from the literature: mild, clear or strong.
Purpose
Used for stress, sleep and recovery, and as a mild 'testosterone booster'. Small RCTs show modest rises in testosterone and strength, mainly in stressed, overweight or untrained men; evidence for sports performance is limited.
What people seek and what studies show
Trials are short and small. Meta-analyses report lower stress and anxiety scores (12 trials; certainty rated low), a small improvement in sleep that is clearer in insomnia (5 trials, 400 people), and better exercise performance on average — most consistently aerobic endurance, while strength effects are uncertain (13 trials, 2026). Long-term safety is poorly studied.
Effects
Evidence: Limited human data — some human studies, small or short
Sought effects by goal (as reported)
Possible side effects
Possible does not mean certain: whether they appear depends on dose, duration, individual response and monitoring. Below — what to watch for and how to notice it early.
4 possible side effects
level · how often it is reportedWhat the levels mean
Level: general category from the literature, not your personal risk
How often
- common
- reported often
- possible
- reported in some people
- rare
- reported occasionally
How to lower the risks
For 3 of 4 possible side effects there are specific ways to lower the chance: everyday measures, supplements and options a doctor may consider. For the rest — general advice. No measure removes a risk completely.
No alcohol, no other liver stressors, limit oral steroids and their combinations, check liver enzymes.
How each option helps (5)
- Avoiding alcohol and other liver stressors — Removes a major extra liver stressor during oral steroids and other hepatotoxic drugs.
- Regular blood tests — ALT, AST, GGT and bilirubin show liver strain before symptoms; heavy lifting alone raises AST/ALT for days, and GGT helps tell muscle from liver.
- Ademetionine (SAMe) — Used for intrahepatic cholestasis in some countries, but trials are small and of low quality; untested in steroid users. Stopping the oral steroid matters most.
- N-acetylcysteine (NAC) — Restores glutathione; proven in paracetamol poisoning and helped in early acute liver failure of other causes, but untested in steroid users.
- TUDCA (tauroursodeoxycholic acid) — Improves bile flow in cholestatic disease; in steroid cholestasis only case reports, with failures in severe cases. Stopping the oral steroid matters most.
Low-level side effects
How each option helps (2)
- Working with a doctor — Assesses persistent vomiting or severe belly pain (possible pancreatitis or gallstones) and adjusts prescribed GLP-1 treatment when nausea persists.
- Pancreatin + dimeticone (Pankreoflat) — May ease heaviness and gas after meals; can cause nausea or diarrhea. Not for pork or cow's milk protein allergy (anaphylaxis reported) or early acute pancreatitis.
How each option helps (1)
- Heart screening: ECG and echocardiogram — An ECG reveals arrhythmias, conduction problems and QT changes — important with stimulants, clenbuterol, thyroid hormone or diuretics.
Check-ups and blood tests
Which tests and check-ups to do and when. This is a guide — agree the exact schedule with your doctor.
Which doctors can help
Get medical help at once if
- Yellow skin or eyes, dark urine, pale stools, intense itching, pain under the right ribs — see a doctor now; sudden severe abdominal pain with dizziness or fainting — call emergency services.
In an emergency, call your local emergency number.
For women
Avoid in pregnancy and breastfeeding: Danish experts cited a possible abortifacient effect and effects on sex and thyroid hormones.
Myth & fact
“Is ashwagandha a strong natural testosterone booster?”
No. Small trials show modest rises, mostly in stressed, overweight or untrained men — nothing comparable to anabolic drugs.
Combinations
Ashwagandha can raise thyroid hormone levels; case reports describe thyrotoxicosis with a racing heart. On top of T3 or T4 it can push thyroid excess further: palpitations, tremor, sweating, insomnia.
LiothyronineLevothyroxineSources
Possible side effects by body system, combinations, how to lower the risks and which tests to do — free.
Open the stack check