Wholesome in bulk™ Tribulus Terrestris Extract Powder
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Bulk Tribulus Terrestris Extract for Supplement Manufacturing
Tribulus terrestris extract is a dry powder made from the fruit or aerial parts of Tribulus terrestris L., a plant in the caltrop family. It is usually standardized to total saponins by UV or a gravimetric method, and some grades state protodioscin by HPLC. We supply it in bulk to supplement brands, contract manufacturers, and formulators.
A saponin extract that compares cleanly once the method is fixed
Tribulus terrestris extract is sold by saponin content, and the grade number depends on the test method. Once method, plant part, and origin are fixed, lots compare cleanly. The cards below set out what to ask for.
Named saponin markers
The extract contains furostanol saponins such as protodioscin and protogracillin. Protodioscin is the usual marker when a lab tests by HPLC or UPLC.
Grades tied to a method
Total saponins are sold at 40%, 45%, 90%, and other levels. Gravimetric, UV, and HPLC results for the same lot can differ, so each grade needs its method beside it.
Plant part on the spec
Suppliers extract the spiny fruit, the aerial parts, or the whole plant. Saponin profiles differ by plant part, so the part belongs on the specification and COA.
Origin and chemotype
Material from Southeast Europe and West Asia shares a profile led by protodioscin. Published testing found Indian and Vietnamese material differs, so origin is part of identity.
Water or ethanol extraction
Extracts are made with water or a water and ethanol mix, then dried to powder. One published spec lists a 10:1 ratio for a water extract of the fruit.
Fine, free flowing powder
Spec sheets call for a brown to yellow brown powder that passes an 80 mesh screen. That suits capsule filling, tableting, and dry blending.
Where formulators use tribulus terrestris extract
This extract fits measured formats where fill weight and serving size are controlled, including:
- Capsules
- Compressed tablets
- Single ingredient powders
- Multiple ingredient botanical blends
- Stick packs and sachets
- Powdered drink mixes
- Gummies, after taste and stability trials
- Private label programs
Plan fill weights from the confirmed assay on each COA. A 45% saponins extract by UV and a 90% saponins extract are not interchangeable gram for gram. Neither converts directly to a protodioscin figure, so recalculate your serving math whenever you change grades.
What to check before you buy tribulus terrestris extract
Two powders sold under the same name can differ in plant part, origin, assay method, and carrier. Review these points together, and ask for lot documents before you approve a supplier.
Plant part and species
Confirm Tribulus terrestris L. and the plant part on both the specification and the certificate of analysis (COA). Fruit, aerial part, and whole plant extracts are all sold under the same name.
Total saponins method
Ask how total saponins are measured: gravimetric, UV, or HPLC. Compare grades only when the method matches, and ask which reference standard the lab uses.
Protodioscin by HPLC
If your formula needs a compound specific number, ask for protodioscin by HPLC or UPLC. It is a narrower check than a total saponin result.
Identity fingerprint
Ask for an HPTLC or TLC fingerprint against a reference standard. It confirms the plant and shows the saponin pattern for that origin.
Origin and chemotype
Ask for the country of harvest. Southeast European and Indian material differ in saponin profile, so a change of origin can change the COA even at the same grade.
Contaminant limits
Check heavy metals by ICP-MS, microbial limits by USP methods, pesticide residues, and residual solvents. Compare each limit with your own finished product specification.
Label math: If your label lists saponins or protodioscin per serving, base it on each lot's measured assay and your own finished product testing. State the method behind your figure, since grades by different methods do not match.
Typical specification for tribulus terrestris extract
These values reflect the common 45% total saponins grade by UV. Final figures come from the specification sheet and COA for your lot. NLT means not less than, and NMT means not more than.
| Parameter | Specification | Method |
|---|---|---|
| Botanical source | Tribulus terrestris L., fruit or aerial parts | TLC or HPTLC fingerprint |
| Appearance | Brown to yellow brown fine powder | Visual |
| Total saponins | NLT 45.0% | UV or gravimetric |
| Protodioscin | Reported on the COA when tested | HPLC or UPLC |
| Extraction solvent and ratio | Water, or water and ethanol, about 10:1 | Supplier declaration |
| Carrier | None, or as named on the specification sheet | Supplier declaration |
| Country of harvest | Provided with your quote | Supplier declaration |
| Particle size | NLT 95% through 80 mesh | USP <786> |
| Loss on drying | NMT 5.0 to 8.0% | USP <731> |
| Bulk density | 0.30 to 0.70 g/mL | USP <616> |
| Lead | NMT 2.0 ppm | ICP-MS |
| Arsenic | NMT 2.0 ppm | ICP-MS |
| Cadmium | NMT 1.0 ppm | ICP-MS |
| Mercury | NMT 0.1 ppm | ICP-MS |
| Total aerobic count | NMT 10,000 cfu/g | USP <2021> |
| Yeast and mold | NMT 1,000 cfu/g | USP <2021> |
| E. coli and Salmonella | Absent in 10 g and 25 g | USP <2022> |
| Pesticide residues | Meets USP <561> | GC-MS and LC-MS |
| Residual solvents | Meets USP <467> | GC |
| Shelf life | 36 months, unopened | Stability data |
Quality standards for tribulus terrestris extract
The fruit of Tribulus terrestris has monographs in the Ayurvedic Pharmacopoeia of India and the Chinese Pharmacopoeia. Bulk extract grades, by contrast, are set by supplier specifications. That makes the assay method, the reference standard, and the plant part the core of any comparison.
Pharmacopoeial listings for the fruit
The Ayurvedic Pharmacopoeia of India lists the fruit as Gokshura in Part I, Volume I (1986). The Chinese Pharmacopoeia records both crude and stir fried Fructus Tribuli. Both list the dried fruit, so an aerial part extract needs its own identity reference.
Telling the fruit from look alikes
A Hong Kong government identification guide separates Fructus Tribuli from the seed of Astragalus complanatus, which has a similar Chinese name. The tribulus fruit splits into axe shaped parts, each with one long and one short pair of spines. Its powder shows exocarp cells and lacks the palisade cells of a seed coat.
Protodioscin by HPLC
The first validated HPLC method for tribulus saponins came from the University of Mississippi natural products center (NCNPR) in 2001. It used an evaporative light scattering detector (ELSD), with protodioscin as the marker. Later methods use diode array detection at 200 nm, UPLC, or LC-MS/MS. Ask which detector and reference standard sit behind a protodioscin figure.
Why color test totals run high
Color test methods read a reaction from a whole group of saponins. Results with Ehrlich reagent depend on acid concentration and temperature, which makes them hard to compare between labs. One method paper found published color test results for raw herb far above HPLC results for similar material. Read a high total saponin figure as a method statement, not a protodioscin content.
What raw herb holds by HPLC
By HPLC, raw tribulus holds protodioscin from a few tenths of a percent to about 2%. Aerial parts from North Macedonia measured 0.65 to 0.73%, and North Bulgarian populations ranged from 0.50 to 2.21%. A 20% protodioscin extract therefore needs 9 to 40 times concentration. A grade well above what the herb and the stated ratio allow deserves a question.
Contaminant limits
USP <2232> sets component limits of 0.5 µg/g for lead and cadmium and 1.5 µg/g for inorganic arsenic and total mercury. Published tribulus specifications include lead and arsenic at NMT 0.5 ppm. One sheet from a Chinese supplier also lists organochlorine pesticide limits of 0.2 ppm for BHC and DDT and 0.1 ppm for PCNB.
Sourcing and processing practices for tribulus terrestris extract
Tribulus quality depends on which plant part was harvested, where, and how it was dried and extracted. These points give QA teams specific questions to ask and verify.
Qualify the population as well as the country
Wild stands differ even inside one region. Across 16 North Bulgarian populations, protodioscin ranged from 5.0 to 22.1 mg/g and prototribestin from 3.1 to 12.1 mg/g. The population with the largest harvestable stand had the lowest content. Ask for HPLC results on the starting herb as well as the extract.
Fix the plant part and harvest stage
Saponin content depends on region, plant part, and stage of growth, according to the main LC-MS work on the species. Fruit and aerial part extracts can carry the same total saponin figure with different profiles. Write the part and the harvest window into the specification, and handle a change in either as a new material.
Control heat during drying and extraction
Heat changes tribulus saponins. In stir fried fruit, furostanol saponins with a C-22 hydroxyl lost water and formed a new double bond. Spirostanol saponins lost their sugars and became free sapogenins. Ask for drying and extraction temperatures, and expect a profile shift if they change.
Ask how high grades were purified
High saponin grades can be purified on macroporous resin after ethanol extraction. One published process used 70% ethanol under reflux, then a macroporous resin column, then freeze drying. Ask for the resin type, the elution solvent, and residual solvent results for each lot.
Keep raw herb identity records
Identity is easiest to prove on the raw fruit or herb. Macroscopy and microscopy confirm the plant before extraction, and an HPTLC fingerprint against botanical reference material confirms it after. Keep both results in the supplier file, with the harvest region.
Watch arsenic as well as lead
On one published COA for a 20% protodioscin fruit extract, arsenic led the four metals at 0.30 ppm, with lead at 0.10 ppm. Arsenic limits on bulk sheets run from 0.5 to 2.0 ppm. If a result sits above 0.5 ppm, ask for inorganic arsenic, the form USP <2232> limits.
Formulator tips for tribulus terrestris extract
Use these points when you set label figures, fill weights, and incoming tests. The figures come from published COAs, supplier sheets, and method papers.
- Do protodioscin label math on the measured value, not the grade name. One published finished product COA read 20% above its protodioscin specification. Base the label on your own finished product HPLC result.
- Keep the detector consistent. Published methods use ELSD, MS, or diode array detection at 200 nm. Use the same detector at the supplier and at your finished product lab, or run a side by side comparison first.
- Plan fill from tapped density. One 45% sheet allows loose density of 0.20 to 0.70 g/mL and tapped density of 0.40 to 0.90 g/mL. On those figures, 500 mg can take 0.56 to 1.25 mL, so ask for the lot value before you choose a capsule size.
- For drink mixes, check solubility and pH. One 40% grade lists NLT 80% solubility in water and a pH of 5 to 7 in a 5% solution.
- Ask for water activity as well as loss on drying. One published COA sets water activity below 0.73 and reports 0.27, with loss on drying at 6.8%.
- Spell out the expression basis on your own label spec. Some products state furostanol saponins calculated as protodioscin, a basis that differs from both a total saponin figure and a protodioscin figure. Test to the basis your label uses.
- Set an incoming test plan. Run HPTLC identity against a fruit or aerial part reference and protodioscin by HPLC on every lot. Add ICP-MS metals with arsenic, a pesticide screen, and residual solvents for resin purified grades. Recheck protodioscin and loss on drying before you use stock past its retest date.
Helping shoppers read a tribulus label
Brands and their customer service teams hear the same label questions often. These answers cover what the ingredient is and how it is labeled.
What the label line means
A typical line reads Tribulus terrestris extract (fruit) or (aerial parts). Supplement Facts panels name the plant part, and the two parts give different extracts. The plant is also called puncture vine, after its spiny fruit.
Saponins and protodioscin on a label
A line such as standardized to 45% saponins is a group figure, often from a color test. A line such as 20% protodioscin names one compound measured by HPLC. Some labels state furostanol saponins calculated as protodioscin, which is a third way to express the figure.
Independent quality programs
Programs such as the USP Dietary Supplement Verification Program and NSF/ANSI 173 certification check finished products against their labels and contaminant limits. A seal names the program, and the program's own website lists the products it covers.
Normal look and home storage
Tribulus extract is a brown to yellow brown powder with a characteristic odor. Color can vary a little from lot to lot. Keep the bottle closed in a cool, dry place away from light.
Storage and handling for bulk tribulus extract
Botanical extracts hold their spec longest when they stay sealed, dry, and out of light. These steps keep the powder in good condition between production runs.
Keep it sealed
Close the inner liner after each use and press out the air. Extract powders pick up moisture from the air and can cake when left open.
Store cool and dry
Keep bags off the floor in a dry room, away from heat sources. Follow the temperature range on the spec sheet.
Keep away from light
Leave the powder in its original opaque packaging. Light and heat can shift color and assay over time.
Rotate stock
Record the lot number and retest date for each bag. Send older lots to production first.
Tribulus terrestris extract buyer FAQ
Quick answers to the questions procurement and quality teams ask most.
What is tribulus terrestris extract standardized to?
It is standardized to total saponins, and some grades also state protodioscin. Common saponin grades include 40%, 45%, and 90%. Check the test method next to each figure, because methods give different numbers.
What is the difference between total saponins and protodioscin?
Total saponins is a broad figure for a whole class of compounds, usually measured by UV or a gravimetric method. Protodioscin is one named saponin, measured by HPLC against a reference standard. The two numbers are not interchangeable.
Why do 40%, 45%, and 90% saponin grades differ so much?
They differ in concentration, and often in test method too. A gravimetric result weighs a solvent fraction of the extract, and a UV result reads a color reaction against a reference compound. HPLC measures named saponins one by one, so compare grades only when the method matches.
Is tribulus extract made from the fruit or the whole plant?
Either can be used, so check the specification. Suppliers list fruit, aerial parts, or whole plant, and the saponin profile differs by part.
Does the origin of tribulus terrestris matter?
Yes, because origin affects the saponin profile. Published testing found material from Southeast Europe and West Asia led by protodioscin, while Indian and Vietnamese samples showed a different pattern. The country of manufacture for each lot is provided with your quote.
What documents can I get with an order?
A certificate of analysis (COA) and a specification sheet ship with every order. An allergen statement and a safety data sheet may also be available, depending on the lot in inventory. Contact us to request them.
Can I get a sample before a bulk order?
You can request one by choosing sample options on the quote form. We will confirm availability, size, and timing.
How should I store an opened bag?
Close the liner, press out the air, and keep the bag in a cool, dry place away from light. Use the powder within the shelf life shown on the COA.
Is there a pharmacopoeia standard for tribulus terrestris?
Yes, the fruit has monographs in the Ayurvedic Pharmacopoeia of India and the Chinese Pharmacopoeia. Bulk extract grades are set by supplier specifications. Ask for the method and reference standard behind each figure on the COA.
Can tribulus fruit be confused with other herbs?
Yes, the seed of Astragalus complanatus has a similar Chinese name and is easily confused with tribulus fruit. A Hong Kong government guide separates them by shape and by microscopy. Ask for identity results on the raw fruit and an HPTLC fingerprint on the extract.
Request a quote for bulk tribulus terrestris extract
Tell us your grade, test method, plant part, quantity, and timing. We will reply with current pricing. Select testing documents and sample options on the quote form.
Order Tribulus Terrestris ExtractBulk orders: Choose a pack size above, or use the quote form for larger volumes, testing documents, and sample options. We serve supplement brands, contract manufacturers, product developers, and formulators.
This bulk ingredient is sold for further manufacturing and formulation. The information on this page describes the ingredient and how commercial buyers evaluate it. It is not medical advice. Each finished product brand is responsible for its own labeling and product claims.
