Ashwagandha: What It Is, KSM-66 and Who Should Avoid It

A traditional Ayurvedic herb that is now everywhere. What the label means, and the safety checks to do first.

By HealthSpot Pharmacy Team
2 min read

Ashwagandha (Withania somnifera) is a herb used for centuries in Ayurveda, the traditional medicine of India. It has become one of the best-selling herbal supplements worldwide. Here is what you need to know before you buy.

What the label means

  • Root extract: most quality products use the root rather than the leaf.
  • Withanolides: natural compounds in ashwagandha. Many extracts are "standardised", meaning each dose contains a set percentage, for example 5%.
  • KSM-66®: a branded, full-spectrum root extract standardised to withanolides.

What can be said about it

Ashwagandha is popular with people looking for support during busy, stressful periods. In the UK and EU there are currently no authorised health claims for ashwagandha, so reputable brands, including ours, do not promise specific effects. Some products add nutrients that do have authorised claims: for example, magnesium and vitamin B6 contribute to normal psychological function.

Who should check with a pharmacist first

  • Pregnant or breastfeeding women: ashwagandha is not recommended.
  • Anyone with a thyroid condition, an autoimmune condition, or liver problems.
  • Anyone taking regular medicines, especially for thyroid, blood sugar, blood pressure, sleep or anxiety, or medicines that affect the immune system.
  • Anyone due to have surgery.

Stop taking it and speak to a doctor if you notice yellowing of the skin or eyes, dark urine or unusual tiredness.

Options at HealthSpot

Not sure what suits you? Our pharmacist will help you choose for free: WhatsApp or call 0748 173 823, or book a consultation.

Food supplements should not replace a varied, balanced diet and a healthy lifestyle. Do not exceed the recommended daily dose on the label. If you are pregnant, breastfeeding, take regular medicines or have a medical condition, speak to our pharmacist or your doctor before taking supplements. This article is general information, not medical advice.