What are the side effects of ashwagandha?

The most common ashwagandha side effects are GI-related: nausea, upset stomach, loose stools (5-10% of users at 600mg/day). Drowsiness is also reported, particularly with Sensoril extract. Taking ashwagandha with food eliminates most GI effects. Rare but serious: liver injury has been reported in case reports (not in clinical trials at standard doses). People with autoimmune conditions, thyroid disorders, or during pregnancy should avoid ashwagandha.

Is it safe to take ashwagandha every day?

Yes — daily use of KSM-66 at 300-600mg/day is safe based on 8-16 week RCT data. No significant adverse effects are documented in clinical trials at standard doses. As a precaution, many practitioners recommend cycling (12 weeks on, 2-4 weeks off) due to limited long-term safety data beyond 16 weeks. Liver injury case reports (outside clinical trials) suggest using reputable, third-party tested brands and avoiding combination with other potentially hepatotoxic substances.

Can ashwagandha cause anxiety or make it worse?

Rarely — but paradoxical anxiety is occasionally reported. This is more common at high doses, when using poor-quality products, or in people sensitive to adaptogens. If you experience increased anxiety on ashwagandha, reduce your dose (try 150-300mg), switch from Sensoril to KSM-66 (or vice versa), or take it with food earlier in the day. Most people experience anxiety reduction, not increases — paradoxical effects are uncommon but possible.

Ashwagandha Side Effects: What Are the Real Risks?

Last updated: mayo 7, 2026

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Safety Guide · 5 min read

Ashwagandha Side Effects: The Complete Safety Profile

Ashwagandha (KSM-66) has an excellent safety profile based on 12+ weeks of RCT data, but it is not without potential side effects. Understanding who is at risk and which effects are reported helps set realistic expectations.

Most Common Side Effects (From Clinical Trials)

Gastrointestinal effects: The most common — nausea, upset stomach, or loose stools at higher doses. These typically resolve after 1–2 weeks as your body adjusts. Taking ashwagandha with food almost completely eliminates GI side effects. Reported in roughly 5–10% of trial participants at 600mg/day.

Drowsiness: Particularly with Sensoril extract (which has more calming alkaloids) and at higher doses. Taking ashwagandha in the morning reduces this. If drowsiness persists, switch to KSM-66 root-only extract or reduce dose to 300mg.

Serious but Rare: Liver Concern

Multiple case reports (not in clinical trials) have documented liver injury associated with ashwagandha use. These are rare but noteworthy. The 2023 review in JAMA identified several cases of hepatotoxicity linked to ashwagandha supplements, typically resolving after discontinuation. Risk factors: pre-existing liver conditions, very high doses, contaminated products, or concurrent use of other hepatotoxic substances (alcohol, other supplements). Standard clinical doses (300–600mg KSM-66) over standard periods (8–16 weeks) have not shown liver enzyme elevations in RCTs. If you have liver disease, consult a doctor before use.

Contraindications: Who Should Avoid Ashwagandha

Pregnancy: Uterine-stimulating properties — clear contraindication. Do not use during pregnancy.
Breastfeeding: Insufficient safety data — avoid.
Autoimmune conditions: Ashwagandha stimulates immune function, which could exacerbate autoimmune diseases (Hashimoto’s, rheumatoid arthritis, lupus, MS). Use with caution and medical supervision.
Thyroid disorders: Ashwagandha may increase T3 and T4 thyroid hormones — relevant for people on thyroid medication. Monitor TSH levels if combining.
Sedative medications: Additive CNS depression possible with benzodiazepines, barbiturates, sleep medications. Avoid or reduce sedative medication doses under medical supervision.

Hormone Interactions

Ashwagandha increases testosterone in men. For women: a 2015 RCT found KSM-66 safe in women with improvements in sexual function and energy. However, women with androgen-sensitive conditions (PCOS, virilization) should use caution — the testosterone-raising effect could worsen these conditions. Women without hormonal concerns can generally use ashwagandha safely at 300–600mg/day.

How to Minimize Side Effects

1. Always take with food (fat-containing meal). 2. Start at 300mg for 2 weeks before increasing to 600mg. 3. Use KSM-66 or Sensoril standardized extract from reputable brands with third-party testing. 4. Don’t exceed 600mg/day without medical reason. 5. Cycle: 12 weeks on, 2–4 weeks off as a precaution. 6. If you notice yellowing skin/eyes or dark urine, stop immediately and consult a doctor (potential liver concern).

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