Quick answer: KSM-66 is a root-only extract commonly standardised to 5% withanolides; Sensoril is a root-and-leaf aqueous extract commonly specified around 10%; Shoden is a concentrated root-and-leaf extract standardised to 35% withanolide glycosides. They are not dose-equivalent, and no independent head-to-head outcome trial proves one is universally best.
Comparing products? Start with the Best Ashwagandha UK (2026) buyer's guide.
KSM-66, Sensoril and Shoden are branded Ashwagandha ingredients, not three names for the same powder. Each uses a particular plant-part and extraction specification, and each has its own dose anchors in published research.
This comparison asks what the human trials actually tested. It does not award a winner simply for having the biggest percentage. To compare finished products and UK prices, use the Best Ashwagandha UK (2026) buyer's guide.
In this article
- KSM-66 vs Sensoril vs Shoden: quick comparison
- What is KSM-66 Ashwagandha?
- What is Sensoril Ashwagandha?
- What is Shoden Ashwagandha?
- Compare active dose without pretending the numbers are identical
- Which extract has evidence for which goal?
- Does Ashwagandha have to be branded?
- Frequently asked questions
KSM-66 vs Sensoril vs Shoden: quick comparison
| Extract | Plant part | Common specification | Examples from human research |
|---|---|---|---|
| KSM-66 | Root only | Often 5% withanolides | Commonly 300 mg twice daily; endurance studies also use root extract across 8-12 weeks |
| Sensoril | Root and leaf | Often around 10% withanolides with a defined glycoside profile | 125-500 mg/day in stress work; 500 mg/day in the STAR training trial |
| Shoden | Root and leaf | 35% withanolide glycosides | 60, 120 or 240 mg/day in stress, sleep and hormone-related trials |
The specifications in this table describe common ingredient documentation, not a guarantee about every finished product. Always verify the current supplier specification and the actual daily serving on the bottle.
Critical limitation: The extracts have not been compared against each other in a large independent trial using the same participants, outcome and active dose. Cross-study rankings are indirect.
What is KSM-66 Ashwagandha?
KSM-66 is a root-only, full-spectrum extract associated with a large commercial research programme. It is commonly standardised to at least 5% withanolides. Many well-known studies use 300 mg twice daily, creating a familiar 600 mg/day dose anchor.
A 2012 randomised stress trial enrolled 64 adults with chronic stress and used 300 mg root extract twice daily for 60 days. The active group improved on stress scales and cortisol compared with placebo. A 2015 endurance trial explicitly identified KSM-66 and reported larger VO2 max gains than placebo in athletic adults over 8 and 12 weeks.
KSM-66's strength is the number and range of published applications. The limitation is that many studies are small, ingredient-linked and not direct comparisons with competing extracts.
What is Sensoril Ashwagandha?
Sensoril is an aqueous root-and-leaf extract with a different withanolide profile and a higher common percentage than many root-only extracts. It has been studied at lower milligram doses for stress and at 500 mg/day in a training context.
A 2024 dose-ranging stress trial tested a well-characterised root-and-leaf aqueous extract at 125, 250 and 500 mg/day for eight weeks. All three doses reduced mild-to-moderate chronic stress measures, with evidence of dose-response. The STAR trial gave recreationally active men 500 mg/day of Sensoril during strength training.
Because Sensoril includes root and leaf, it should not be marketed as if it were chemically identical to a root-only extract. Its evidence belongs to its own profile and dose.
What is Shoden Ashwagandha?
Shoden is a highly concentrated root-and-leaf extract standardised to 35% withanolide glycosides. Its studied serving is therefore much smaller in milligrams than many 5% root extracts.
In a six-week sleep trial, 150 adults with non-restorative sleep received 120 mg/day and showed improvements across subjective and actigraphy measures. A 60-day stress trial used 240 mg/day; a later dose comparison tested 60 and 120 mg/day in adults with high stress and anxiety.
Shoden's concentration is a formulation advantage when space is limited. It is not proof that it produces larger clinical effects than KSM-66 or Sensoril, because the trials do not provide that direct comparison.
Turn the evidence into a product comparison.
The main UK guide compares extract, active dose, safety, format and value without relying on front-label milligrams.
Read the 2026 buyer's guideCompare active dose without pretending the numbers are identical
| Illustrative serving | Specification | Arithmetic result | Caution |
|---|---|---|---|
| 600 mg KSM-66 | 5% withanolides | 30 mg | Typically total withanolides; check current certificate |
| 250 mg Sensoril | 10% withanolides | 25 mg | Profile and withaferin-A limits matter |
| 120 mg Shoden | 35% withanolide glycosides | 42 mg glycosides | Glycoside specification is not automatically identical to total-withanolide methods |
The calculation is useful for transparency. It is not a valid way to declare that 42 “beats” 30, because the chemical family counted and the surrounding extract differ. The withanolides explainer covers that distinction.
Which extract has evidence for which goal?
| Goal | Useful trial anchors | Honest conclusion |
|---|---|---|
| Stress | KSM-66-style root extract, Sensoril root-and-leaf and Shoden all have controlled trials | All three have supportive evidence; no direct winner |
| Sleep | Shoden has a dedicated non-restorative-sleep trial; broader reviews include several extracts | Evidence is positive but average effects are modest |
| Training and endurance | KSM-66 and Sensoril both have exercise studies | Population and training plan strongly affect relevance |
| Testosterone | KSM-66-style training studies and Shoden hormone trials report positive findings | Not established as treatment for low testosterone |
| General label clarity | Any branded extract should be traceable to a specification | A generic extract can also be good if equally well characterised and tested |
Does Ashwagandha have to be branded?
No. A branded ingredient can make the chain from product to trial easier to follow, but a trademark is not a substitute for quality. A generic root extract can be credible when it states the plant part, extraction specification, active amount, testing method and batch controls.
SuperDosed Ashwagandha is built around a root extract standardised to 5% withanolides at 1,000 mg per daily serving, providing 50 mg withanolides. The buying question is whether that disclosed active dose, powder format and price fit your goal, not whether the label displays one of three trademarks.
The UK Ashwagandha buyer's guide compares finished products on the same practical criteria.
Key takeaway: KSM-66, Sensoril and Shoden are distinct extracts with different dose anchors. Choose by the evidence relevant to your goal, full active dose, safety and label clarity - not by trademark or percentage alone.
SuperDosed label context
1,000 mg root extract, standardised to 5% withanolides: 50 mg withanolides per daily serving.
The powder serving also contains 10 mg piperine and is taken as two scoops. See SuperDosed Ashwagandha. A disclosed active dose makes comparison easier; it does not guarantee an individual result.
Frequently asked questions
Is KSM-66 the best Ashwagandha?
It has a broad trial library and a clear root-only specification, but no head-to-head trial proves it is universally superior.
Is Sensoril stronger than KSM-66?
Sensoril is usually more concentrated by percentage and uses root plus leaf. Stronger per milligram is not the same as better for every outcome.
Why is the Shoden dose so low?
Shoden is standardised to a high concentration of withanolide glycosides, so studies use fewer extract milligrams.
Which is best for sleep?
Shoden has a dedicated six-week trial in non-restorative sleep. Broader sleep evidence includes other extracts, and no direct comparison establishes a winner.
Which is best for stress?
All three have supportive stress-related studies. Product quality, dose, tolerability and the relevance of the participant group matter.
Can a non-branded extract work?
Yes, if it is genuinely characterised, standardised and tested. A vague generic ingredient is harder to connect to clinical evidence.
Where can I compare finished UK products?
Read the 2026 UK buyer's guide for dose, extract, safety and value comparisons.
Sources and further reading
- High-concentration root-extract stress trial
- KSM-66 endurance trial
- Sensoril STAR resistance-training trial
- Root-and-leaf aqueous extract dose-ranging stress trial
- Shoden 240 mg/day stress trial
- Shoden 120 mg/day sleep trial
- Shoden 60 and 120 mg/day stress trial
- Bioavailability comparison of four standardised extracts
Compare evidence, active dose and value together.
The buyer's guide is the central page for choosing an Ashwagandha supplement in the UK.
Open the UK buyer's guideEditorial note: SuperDosed sells an Ashwagandha supplement. This article separates research findings from product information and cites primary studies or official guidance wherever possible. It provides general information, not medical advice, and does not claim that Ashwagandha prevents, treats or cures disease.
