Two bottles sit on a shelf. Both say "Ashwagandha extract, standardized to 5% withanolides." Same herb, same percentage, similar price. One of them contains the plant material used in the clinical research you've probably heard about. The other doesn't.
The difference is one word — and most labels are in no hurry to print it.
Root is the part with the track record
Ashwagandha (Withania somnifera) has been used in Ayurvedic practice for well over two thousand years — and that tradition is built on the root. When researchers began testing ashwagandha in modern randomized, placebo-controlled trials — for stress, relaxation, and sleep quality — the overwhelming majority of that work used root extracts, typically at 250–600mg per day.
KSM-66®, the most studied branded ashwagandha extract in the world, is root-only by design — its manufacturer has spent 14+ years and 70+ published clinical studies on that specific root extract. When someone cites "the ashwagandha research" on a podcast, this is, more often than not, the material they're citing.
So why do some products use leaf?
Three practical reasons — none of them about your sleep:
- Leaves are cheaper. They grow back; harvesting roots means harvesting the whole plant. Leaf biomass costs less per kilo, which matters at mass-market scale.
- Leaves are naturally higher in withanolides. That sounds like a good thing — until you realize it means a label can hit an impressive "5% withanolides" number using less (and cheaper) material. The percentage tells you about a marker compound. It tells you nothing about whether the extract matches what was studied.
- Most buyers never ask. "Ashwagandha extract" sounds identical either way.
To be clear: this isn't a safety scare. Leaf extract isn't poison. The point is narrower and more important — if the reason you're buying ashwagandha is the clinical research, then it matters whether your capsule contains what the clinical research actually tested. There is an ongoing debate inside the supplement industry about leaf versus root for exactly this reason, and the traditional pharmacopeia standard has centered on root.
How to read an ashwagandha label in 20 seconds
- Find the plant part. Does it say "root extract"? If the label just says "ashwagandha extract" or says "leaf" — you now know why.
- Look for a branded, studied extract. A name like KSM-66® means the extract carries its own published research file — you're not extrapolating from a different material.
- Check the dose against the research. Most positive trials used 250–600mg of root extract per day. A "proprietary blend" that hides the ashwagandha dose inside a multi-gram mixture makes this check impossible — which is usually the point.
- Ignore the withanolide percentage alone. It's a standardization marker, not a quality verdict — and it's the number leaf-based extracts are best at inflating.
Where we stand
Night Reset uses KSM-66® ashwagandha — root-only, standardized to 5% withanolides — at 600mg per night, the full dose range used in the published research, printed plainly on the label. No blends to hide it in. It's there to support a calmer stress response as part of your evening wind-down.†
Not because root is magic. Because if we're going to point at the research, we'd rather be holding the same thing the researchers were.
See the full Night Reset label →
This article is for educational purposes and is not medical advice. Talk to your healthcare provider before starting any supplement, especially if you take medication or manage a health condition.
†These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.