Ashwagandha (Withania somnifera) is one of the most popular adaptogenic herbs used for stress, sleep, and general wellbeing. Clinical studies suggest it may lower cortisol levels and improve sleep quality in adults with mild to moderate stress. However, ashwagandha is a potent herb with real side effects and drug interactions — it should be treated as a supplement that warrants medical awareness, not a casual kitchen remedy.
Documented Benefits
Most evidence comes from studies using standardised root or root-and-leaf extracts at doses of 300–600 mg daily for eight to twelve weeks. Benefits observed in research include:
- Stress and anxiety reduction — may lower perceived stress scores and cortisol levels
- Sleep improvement — helps some people fall asleep faster and feel more rested
- Physical performance — modest improvements in strength and recovery in active adults
- Cognitive support — early evidence suggests benefits for attention and memory under stress
- Thyroid support — may increase thyroid hormone levels in subclinical hypothyroidism (requires monitoring)
How to Take Ashwagandha at Home
Standardised capsules or tablets
The most reliable approach for consistent dosing. Look for products standardised to at least 5% withanolides. A typical research dose is 300 mg taken twice daily with food. Start with a single 300 mg dose for one week to assess tolerance before increasing.
Ashwagandha powder (churna) with warm milk
Mix a quarter to half teaspoon of ashwagandha root powder into warm milk with a pinch of nutmeg before bed. This traditional preparation supports sleep. Powder potency varies between brands, so measure carefully and do not exceed one teaspoon daily without medical guidance.
Timing and duration
Take with meals to reduce stomach upset. For sleep benefits, an evening dose works best. Most studies run eight to twelve weeks — assess how you feel after six weeks and discuss continued use with your doctor. Cycling off for two to four weeks after three months of daily use is a prudent approach.
Common Side Effects
Ashwagandha is generally well tolerated at standard doses, but side effects do occur. Reported issues include:
- Digestive upset — nausea, diarrhoea, or stomach discomfort; usually reduced by taking with food
- Drowsiness — especially at higher doses or when taken during the day
- Headache — occasional, often resolves by lowering the dose
- Liver effects — rare cases of liver injury linked to ashwagandha supplements have been reported; stop immediately if you notice jaundice, dark urine, or upper abdominal pain
- Hormonal effects — may increase testosterone; relevant for people with hormone-sensitive conditions
Who Should Avoid Ashwagandha
- Pregnancy and breastfeeding — may cause miscarriage; avoid entirely
- Autoimmune diseases — lupus, rheumatoid arthritis, multiple sclerosis — may stimulate immune activity
- Thyroid disorders — can raise thyroid hormones; requires monitoring if you take levothyroxine
- Surgery — stop at least two weeks before scheduled surgery due to sedative and immune effects
- Sedative medications — benzodiazepines, sleeping pills — additive drowsiness risk
- Immunosuppressants — may counteract medication effects
When to See a Doctor
- Stress, anxiety, or low mood lasting more than two weeks and affecting work or relationships
- Insomnia persisting despite good sleep hygiene for more than one month
- Any plan to combine ashwagandha with prescription medications
- Symptoms of thyroid dysfunction — unexplained weight change, fatigue, hair loss, heat or cold intolerance
- Signs of liver problems while taking ashwagandha — yellow skin or eyes, persistent nausea