Recognising Ashwagandha Quality: Extract, Withanolides & Purity

Two ashwagandha tins on the shelf, almost the same price - and yet worlds apart. One contains loose, variable root dust, the other a precisely standardised extract. Anyone who does not know the difference quickly pays for air. So, straight up front:

You can recognise good ashwagandha quality by three things: a standardised withanolide content stated as a percentage, a clearly named extract (rather than mere powder) and a transparently stated plant part - preferably the root. Added to that are a purity test for heavy metals and a traceable origin.

Ashwagandha (Withania somnifera) is one of the best-known plants of the Ayurvedic tradition and is counted among the adaptogens. Important for context: no health claims are currently approved for ashwagandha in the EU - so here we assess exclusively quality features, not any effects.

Withanolides: the marker value for standardisation

The withanolides are the characteristic constituents of the ashwagandha plant - a group of plant compounds that serve as marker substances for standardisation. For quality they are what the alcohol content is for wine: the objective, comparable measurement. A high-quality extract states the withanolide content as a percentage - for example 5% or more.

Pure root powder, by contrast, contains only a small, naturally varying proportion, often well under one percent, depending on harvest, soil and storage. So anyone who wants a defined content should look for a standardised extract with a clear percentage figure. The content itself is a pure comparison and quality feature and says nothing about any effect.

Extract type and plant part

Traditionally the root in particular is used - it stands at the centre of centuries of Ayurvedic use. Some extracts additionally or exclusively use the leaves, which can have a different withanolide pattern. Leaf portions are not inherently bad, but a good label makes them transparent instead of concealing them.

Well-known, well-studied branded extracts are frequently offered with a fixed withanolide percentage and a defined origin. Which extract types exist and what lies behind designations such as KSM-66 is described in Ashwagandha extracts: KSM-66 & root.

Extract ratio and carriers: the traps in the small print

Besides the withanolide percentage, you will sometimes encounter an extract ratio such as "10:1". It indicates how much raw material the extract was obtained from - sounds impressive, but on its own says little about the withanolide content. The standardised percentage value is far more meaningful. So do not be dazzled by a high ratio figure if the decisive percentage is missing.

Also watch out for carriers: some extracts are adjusted to a certain withanolide content with plant-based carriers - that is legitimate, but should be cleanly declared. A good label makes these details verifiable instead of advertising only with buzzwords.

Purity and origin

As with all plant raw materials, purity is central. Roots draw up from the soil whatever the soil yields - including heavy metals such as lead or cadmium. With imported raw materials in particular, a test for heavy metals and other impurities is therefore a genuine quality signal, not a marketing accessory. Transparent origin information and organic quality speak for care in cultivation and in the supply chain. For assessing organic, Organic in supplements helps, and what a laboratory test achieves is explained in Lab-tested - what does that mean?

Why so many people reach for ashwagandha

Ashwagandha has been used in the Ayurvedic tradition for more than two millennia - the name can be loosely translated as "smell of the horse", a reference to the characteristic smell of the fresh root and, according to tradition, to the strength attributed to it. It is counted among the adaptogens, a group of plants traditionally used in times of increased demand. Today many people reach for it in demanding phases of life - in a stressful job, in intense training blocks, in restless times. This describes what people do, and is not a promise of effect: we deliberately classify ashwagandha as a traditionally used plant, because no health claims are approved for it in the EU. What fundamentally characterises adaptogens is explained in Adaptogens at a glance & compared.

Dosage form: capsule or powder

Ashwagandha is available above all as a capsule and as a powder. Capsules are conveniently dosed and neutral in taste - a real advantage, because the powder has a strong, slightly bitter flavour of its own that not everyone likes. Root powder can traditionally be stirred into warm (plant) milk, as has long been customary in Ayurveda. For a defined withanolide content, standardised extracts in capsule form are the easiest to compare and dose. What suits you is explored in depth in Ashwagandha: Capsule or Powder?

Reading the label: the three most common marketing traps

So that you can decide quickly in the shop or shopping cart, here are the typical pitfalls at a glance:

1. Large milligram figure without a withanolide statement. "600 mg ashwagandha" sounds like a lot but says nothing about the concentration of the marker substances. Without a percentage figure, the most important comparison value is missing.
2. High extract ratio as a dazzler. A "10:1" without a standardised withanolide percentage is hard to assess - the percentage figure is more meaningful.
3. Concealed plant part. If it is not stated whether root or leaf is used, transparency is lacking. Reputable suppliers declare this.

Anyone who checks these three points can already tell from the label whether a preparation is cleanly made. How to decode labels in general is shown in Supplements: reading the label correctly.

What the research is looking into

Ashwagandha is intensively researched as an adaptogen and traditional Ayurvedic medicinal plant. Among other things, research is concerned with the withanolides as characteristic constituents, with differences between root and leaf extracts, and with the standardisation of preparations. The traditional use over centuries is also the subject of ethnobotanical study. For the EU, however, the following applies: no health claims are currently approved, which is why we deliberately describe ashwagandha as a traditionally used plant and via its quality features - and claim no effects.

How do I recognise good ashwagandha quality? The checklist

Honestly put into perspective

Established and objectively verifiable are the quality features: withanolide content, extract type, plant part, purity and origin. These criteria help you compare preparations properly. What we cannot and may not tell you are specific health effects - for that, the approval is missing in the EU. So a high withanolide content is a sign of a concentrated, well-standardised extract, no more and no less. In case of persistent complaints, during pregnancy and breastfeeding, and when taking medication, use should be clarified with a doctor.

Suitable products from Scheunengut

You will find standardised extracts and root products in the category Ashwagandha. For adaptogens and phases of rest, it is worth a look at Stress & Exhaustion; related mushrooms and plants can be found under Medicinal Mushrooms.

For further reading: Adaptogens - what are they?, Ashwagandha vs. Rhodiola, Ashwagandha: Effect & Use, Ashwagandha in the morning or evening and Ginseng or ashwagandha compared.

Frequently Asked Questions (FAQ)

How do I recognise high-quality ashwagandha?

By a standardised withanolide content stated as a percentage (e.g. 5%), a clearly named extract rather than mere powder, a transparently stated plant part (preferably root), as well as a test for heavy metals and a traceable origin.

What are withanolides and why are they important?

Withanolides are the characteristic constituents of the ashwagandha plant and serve as marker substances for standardisation. The withanolide content stated as a percentage is the central, objectively comparable quality feature of a preparation.

Is extract better than powder?

For a defined, comparable withanolide content, a standardised extract is advantageous, because powder has a low, naturally varying content. But root powder has its justification in traditional use. Which form fits depends on the goal.

What does an extract ratio such as 10:1 mean?

It indicates how much raw material the extract was obtained from. This figure alone, however, says little about the withanolide content - the standardised percentage value is far more meaningful and the better benchmark for comparison.

How we at Scheunengut ensure tested purity from raw material to tin is explained on our page about the Clean Earth Badge.