"20% extract", "full-spectrum", "4:1", "native" - the words on an extract datasheet describe very different products, and confusing them is one of the most common sourcing mistakes. This guide untangles the main extract types and the extraction methods behind them, so a buyer can read a specification, compare two offers on equal terms, and write a brief that gets the material they actually want.
1. What "Extract" Really Means
An extract is what you get when a solvent is used to pull soluble compounds out of a plant, and the solvent is then removed. The native extract is that concentrated plant material before anything else is added. What varies enormously is how much the actives have been concentrated, which compounds were targeted, and what (if anything) was added afterward as a carrier. The type labels below all describe different answers to those questions.
2. Standardized Extracts
A standardized extract is processed and verified to deliver a guaranteed level of one or more marker compounds - for example ashwagandha standardized to 5% withanolides, or green tea to 50% EGCG. Standardization gives formulators dependable, batch-to-batch consistency on the compound that matters for the claim or the clinical dossier.
The critical detail for buyers is that a standardized figure is only as meaningful as the marker and the test method behind it. "10% gymnemic acids by gravimetric" and "10% by HPLC" describe different realities. Always read the assay together with its method (our COA guide covers this in detail).
3. Full-Spectrum Extracts
A full-spectrum (or "whole-herb") extract aims to preserve the plant's natural balance of constituents in roughly their native ratio, rather than concentrating a single marker. The rationale is that the plant's activity may come from many compounds acting together, not one isolated marker. Full-spectrum extracts are popular in traditional and "clean-label" positioning. The trade-off is that active levels track the raw material and are inherently more variable, so consistency depends heavily on raw-material control and good manufacturing.
4. Ratio Extracts (4:1, 10:1)
A ratio extract states how much raw herb went into the finished extract. A 4:1 extract means 4 kg of starting material yielded 1 kg of extract; a 10:1 is more concentrated still. Ratio is a useful shorthand for concentration, but on its own it does not guarantee a specific active content, because the marker level in the raw herb varies by origin, season and part. A ratio claim is strongest when paired with an assay - e.g. "10:1, standardized to 2% marker".
Buyer takeaway: Type answers "how was it made and expressed"; assay answers "how much active is in it". Ask for both. A number without a method, or a ratio without an assay, is only half a specification.
5. Extraction Methods - Why They Matter
The method used to make an extract shapes its purity, its residual-solvent profile, which compounds it captures, and its cost. The four you will meet most often:
| Method | Best for | Residual solvent risk | Notes |
|---|---|---|---|
| Water (aqueous) | Water-soluble compounds (many polysaccharides, some glycosides) | None | Clean and low-cost; cannot capture lipophilic actives |
| Hydro-alcoholic (water + ethanol) | A broad polarity range; the workhorse for many botanicals | Low (ethanol) | Versatile; residual ethanol easily controlled |
| Organic solvent (e.g. acetone, hexane) | Specific lipophilic or coloured fractions, oleoresins | Requires testing & control | Efficient but residual solvents must meet ICH limits |
| Supercritical CO2 | Volatile oils, lipophilic actives, oleoresins | None | Solvent-free, selective, premium quality - higher cost |
Matching method to chemistry is the whole game. A water extraction will never efficiently capture a fat-soluble compound, and using a heavy organic solvent where water would do adds needless residual-solvent risk. Supercritical CO2 is prized for volatile and lipophilic materials precisely because it leaves no solvent behind, at the cost of more expensive equipment.
6. Carriers & Excipients
After extraction, a carrier such as maltodextrin, gum arabic or dicalcium phosphate is often added - to aid drying, improve flow, or dilute a very potent native extract down to a target assay. Carriers are legitimate and sometimes necessary, but they dilute the native extract, so the specification should state which carrier and how much. Two "20%" extracts can contain very different amounts of native plant material once the carrier is accounted for.
7. How Standardization Is Verified
The assay method behind a standardized claim determines how trustworthy - and comparable - it is:
- HPLC - separates and quantifies specific markers; the most selective and least easily inflated.
- UV-Vis - measures a class of compounds at one wavelength; can read higher than HPLC for the same material.
- Gravimetric - weighs a whole fraction (e.g. total saponins); useful but non-selective.
- Titration - a chemical endpoint method; traditional, and may over-read against a specific marker.
8. Writing a Specification That Gets What You Want
Put it all together and a good extract brief names every variable that matters:
- Botanical and plant part - e.g. Bacopa monnieri, whole herb.
- Type - standardized, full-spectrum or ratio.
- Marker, target level and method - e.g. 20% bacosides by HPLC.
- Extraction solvent - and any carrier, with percentage.
- Physical spec - mesh, moisture, solubility.
- Contaminant & micro limits - matched to your destination market.
This guide is general technical information for B2B buyers and is not formulation, regulatory or medical advice. The appropriate extract type, marker and method depend on your product and market; confirm the specification suited to your application.
9. How SV Botanica Supplies Extracts
As a B2B exporter of herbal extracts, spices, oleoresins and natural oils, SV Botanica supplies standardized, full-spectrum and ratio extracts across our catalogue, with the extraction method matched to each botanical's chemistry and every batch backed by a Certificate of Analysis stating the marker, target level and test method. Where a carrier is used it is declared on the specification, and contaminant and microbiological testing is prepared to your destination market's requirements.
Not sure which type or method you need? Tell us the compound and the application, and we will recommend the extract type, marker method and specification that fits - and supply material made to it.
Frequently Asked Questions
What is the difference between a standardized and a full-spectrum extract?
A standardized extract is processed and verified to contain a guaranteed level of one or more marker compounds - for example 5% withanolides. A full-spectrum extract aims to preserve the plant's natural balance of constituents in roughly their native ratio, without concentrating a single marker. Standardized extracts offer consistency on a target compound; full-spectrum extracts prioritise the whole phytochemical profile.
What does a ratio extract like 4:1 mean?
A ratio extract expresses how much raw herb was used to make the finished extract. A 4:1 extract means four kilograms of starting material were reduced to one kilogram of extract. Ratio alone does not guarantee a specific active content, because the concentration of markers in the raw herb varies, so a ratio claim is best paired with an assay figure.
Which extraction method is best for herbal extracts?
There is no single best method - it depends on the target compounds. Water and hydro-alcoholic extraction suit water- and moderately polar constituents and leave the least solvent residue. Supercritical CO2 excels for lipophilic compounds and volatile oils and leaves no solvent residue, but is more costly. The right method is the one matched to the chemistry of the compound you want.
Does the extraction solvent affect compliance and safety?
Yes. If an organic solvent is used, residual solvent levels must be controlled and tested against ICH/pharmacopoeial limits. Water and hydro-alcoholic (ethanol) extracts carry the lowest residual-solvent risk, while supercritical CO2 leaves no solvent residue at all. The Certificate of Analysis should report residual solvents for any solvent-extracted product.
How should I specify an extract when ordering?
Specify the botanical and plant part, the type (standardized, full-spectrum or ratio), the marker compound and target level with the test method (e.g. 20% saponins by gravimetric or HPLC), the extraction solvent and any carrier, and the contaminant and microbiological limits for your market. The tighter the specification, the more consistent and comparable the material you receive.
Specify Your Extract with SV Botanica
Standardized, full-spectrum & ratio extracts · Method matched to chemistry · COA with marker & method · Samples for qualified buyers