Ashwagandha Root vs Leaf vs Whole-Plant Extracts and Forms

The question

Ashwagandha supplements are made from different parts of the plant, in different forms. Does that matter? According to the sources we read, yes: the plant part and the extract change what is in the product, and the research does not treat them as interchangeable.

The plant and its parts

Ashwagandha is Withania somnifera (L.) Dunal, a shrub in the family Solanaceae (accepted name per GBIF). [1][2] NCCIH notes that supplements typically contain root, leaf, or root/leaf extracts. [2] A 2026 review adds that "leaf and whole-plant" preparations have become increasingly available, but dedicated safety characterization for them remains limited. [3] A 2026 quality study describes the traditional use as root-only. [4]

What "withanolides" means

Withanolides are a group of substances found in the plant and are the usual "marker" compounds on labels. [2] The profile differs by part: a 2026 review reports that root is dominated by withanolide A, D and glycol-withanolides, while leaf is richer in withaferin A and related compounds. [3] A laboratory analysis of plants grown under different treatments also found the highest withaferin A in leaves and the highest withanolide A and B in roots. [5] That analysis looked at plant material, not at supplements or people.

Labels can state a marker percentage. One trial used a root extract standardized for 2.5% withanolides, and another delivered 21 mg of withanolide glycosides a day. [6][7] Those numbers describe those extracts only; they do not make other products equivalent.

Comparing the forms

See also ashwagandha gummies, powders, teas and tinctures and powders vs extracts.

A trial of one extract does not transfer to another

A review of 23 studies in healthy adults included only single-ingredient, standardized root-only extracts, and found biomarkers stayed in normal ranges. [8] That finding applies to those extracts. It does not tell us about a leaf product, a multi-ingredient blend or a tea. The same review says recent liver case reports mainly involved non-standardized or multi-ingredient formulations. [8] Another 2026 review says European risk assessments and the Danish ban raised concerns about "ashwagandha" without consistently distinguishing plant parts. [3] We could not open the Danish authority's own pages, so we cannot describe the ban's details. A liver case series said chemical analysis confirmed ashwagandha in supplements, and its abstract does not say which plant part. [16] Do not read this as "root is safe, leaf is dangerous": the sources say the human evidence is too thin to compare. See side effects and liver injury reports.

Quality, mixing and adulteration

A 2026 study measured withanolide-type compounds in 25 commercial products and found that only 10 met both the British and US pharmacopoeia standards used; only two were confirmed as root-derived. [4] The authors tied the failures to a compound found mainly in leaf samples and said the commercial use of aerial parts raises quality and safety concerns. [4] A review also says analytical surveys have documented root material adulterated with leaves and stems. [3] We cannot say how these numbers apply to any particular product. For what labels and testing can tell you, see quality testing and certifications and plant parts in adaptogen products.

Practical reading of a label

• Look for the plant part (root, leaf, or both) and whether it is an extract or a powder.
• Check whether a marker amount is stated and what it measures.
• A trial result is tied to the exact extract tested. Ask a pharmacist how a product compares with what was studied.
• Safety cautions in NCCIH's summary apply to ashwagandha as a whole, including pregnancy, thyroid and autoimmune conditions, and medicine interactions. [2] See medicine interactions.

For the main profile, see Ashwagandha.