If you are formulating with ashwagandha, you will receive quotations that differ by a factor of three or more for what appears to be the same product. The variation is not arbitrary and it is not mostly about supplier greed. It reflects four genuine specification decisions, and understanding them is the difference between buying well and buying blind.
Question one: root, or root and leaf?
Withania somnifera is traditionally used as a root. The leaf contains withanolides too — in fact it is considerably richer in withaferin A — and it is far cheaper to produce because it does not require lifting and cleaning the root.
That combination creates an obvious temptation. Adding leaf material raises the headline withanolide figure at a fraction of the cost, and the resulting powder will pass a total-withanolide assay comfortably. What changes is the composition: a root extract and a root-and-leaf extract have different withanolide profiles, and the traditional-use literature your marketing is probably leaning on is about the root.
So the first line on any ashwagandha specification should be the plant part, and it should appear on the Certificate of Analysis rather than in a sales email. If a supplier will not state it, that is your answer.
Question two: which assay method?
This is where most of the price gap actually lives. There are two common approaches and they do not measure the same thing.
Gravimetric and UV methods capture a broad class of compounds that behave in a particular way. They are cheap, fast, and they read generously — a range of non-withanolide constituents will contribute to the figure.
HPLC separates the individual glycowithanolides and quantifies them specifically. It is more expensive and it produces a lower, harder number.
The same physical material can honestly be described as 5% by HPLC or as a much higher figure by a gravimetric method. Neither certificate is fraudulent. But if you specify "5% withanolides" without naming the method, you have left the supplier free to choose, and the cheapest way to satisfy your specification is the method that reads highest. Always write the method into the specification.
Question three: what percentage do you actually need?
Higher is not automatically better. It is more concentrated, which matters when capsule volume is your constraint, and it costs more per kilogram.
- 2.5% withanolides (HPLC). Suits blends and powdered formats where ashwagandha is one component among several and dose volume is not tight.
- 5% withanolides (HPLC). The market standard and the specification most published dosing is built around. This is our standard offer.
- 10% withanolides (HPLC). For high-potency single-ingredient capsules where you need the dose in the smallest possible volume.
- Full-spectrum 10:1 root extract. A ratio rather than a marker. Chosen where the product is positioned on whole-root tradition rather than a standardised active, and where the label benefits from saying root extract rather than a percentage.
The right answer comes from the finished product, not from the ingredient. Work backwards: what dose does the label claim, what capsule or serving size is the format, and what does that imply for concentration? Then buy the specification that fits, rather than the highest number you can afford.
Question four: branded, or generic?
A significant share of the ashwagandha market moves as branded, patented extracts owned by specific manufacturers. They come with published clinical trial material, a recognisable name for the label, and a price that reflects both.
Generic standardised root extract, assayed by HPLC to the same withanolide specification, delivers the same specification without the licence. The honest way to choose between them is to ask what the brand name is doing for you. If your marketing is going to reference specific published trials, you generally need the branded ingredient those trials were conducted on — borrowing another ingredient's clinical data is both scientifically and legally shaky. If your product is sold on your own brand and the ingredient is simply an ingredient, the generic is the sensible commercial choice.
A short due-diligence list
- Plant part stated on the certificate, not in an email.
- Assay method named in the specification and matching on the COA.
- Batch number on the certificate matching the drum you received.
- Heavy metals reported — a concentrated root extract concentrates soil contaminants too.
- Residual solvent reported where hydro-alcoholic extraction was used.
- The certificate of the actual quoted batch, verified independently on the first delivery.
What we supply
Our standard offer is root-only extract at 5% withanolides by HPLC, in 25 kg drums, with a batch-tied Certificate of Analysis for the lot being quoted. 2.5%, 10% and full-spectrum 10:1 are available to order. If you are currently buying against a specification and want to know whether we can match it, send us the certificate with the supplier name removed — we will tell you plainly whether we can hold it, and we would rather lose the enquiry than promise a specification we cannot repeat.