Wholesome in bulk™ Slippery Elm Inner Bark Powder (Ulmus rubra)
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Bulk Slippery Elm Inner Bark Powder for Supplement Manufacturing
Slippery elm powder is a fine powder milled from the dried inner bark of the slippery elm tree, Ulmus rubra Muhl. Older documents call it Ulmus fulva. The outer bark is removed before drying, and the inner bark forms a thick gel in water. We supply it in bulk to supplement brands, contract manufacturers, and formulators.
A North American inner bark with clear physical identity checks
Slippery elm powder is specified by species, plant part, and physical behavior rather than by a marker compound. Microscopy, a simple water test, and origin records give buyers and quality teams practical checks for each lot.
Inner bark only
Harvesters strip the bark and scrape off the rough outer layer before drying. Good inner bark is smooth, leathery, and creamy white before milling.
Gel forming mucilage
The inner bark holds large mucilage cells. Stirred into water, the powder forms a thick, fawn colored jelly, which doubles as a quick quality check.
A North American tree
Ulmus rubra is native to the central and eastern United States. Bark for the trade has long come from this range.
Light tan, fine powder
The powder is very light brown to brown yellow. Supplier sheets call for at least 95% through 80 mesh and a bulk density of about 0.40 to 0.60 g/mL.
Microscopic markers
Under a microscope the powder shows starch grains, long bast fibers, calcium oxalate prisms, and fragments of mucilage cells. Together they confirm inner bark.
Harvest records
Most slippery elm bark is wild harvested. United Plant Savers tracks the species, so harvest method and origin documents help you meet sourcing commitments.
Where formulators use slippery elm inner bark powder
The powder fits measured formats where fill weight and texture are controlled, including:
- Capsules
- Compressed tablets
- Single ingredient powders
- Multiple ingredient botanical blends
- Tea and hot beverage blends
- Powdered drink mixes, after viscosity trials
- Stick packs and sachets
- Private label programs
Slippery elm powder thickens liquids quickly. Run viscosity trials before you scale a drink mix, and keep capsule and tablet rooms dry so the powder flows evenly.
What to check before you buy slippery elm inner bark powder
Powders sold as slippery elm can differ in species, plant part, and origin. Review these points together, and ask for lot documents before you approve a supplier.
Species and origin
Confirm Ulmus rubra on the specification and certificate of analysis (COA), with the country and region of harvest. Other Ulmus species are traded in Asia, so an origin outside North America calls for extra identity evidence.
Inner bark, not wood
Ask for inner bark with the outer bark removed. Adhering outer bark and wood are the usual foreign matter, so check the foreign matter limit on the spec.
Identity by microscopy and TLC
Microscopy confirms inner bark tissue, and a thin layer chromatography (TLC) fingerprint compared with a reference adds evidence for the species. HPLC fingerprints can separate elm species when origin is in question.
Gel test
Stir a small amount of powder into water. Good inner bark forms a thick jelly within about 15 minutes. A thin result points to poor bark or added starch.
Harvest method
Ask whether the bark was wild harvested or cultivated, and how it was collected. Bark from naturally felled trees or managed stands gives you a stronger sourcing record.
Contaminant limits
Check heavy metals by ICP-MS, microbial limits by USP methods, and pesticide residues. Bark powders are used at gram amounts, so compare each limit with your finished product specification.
Origin statement: Ask for a written statement of the country and region where the bark was harvested. Keep it with the COA in your supplier file, because origin is the first question a quality auditor asks about slippery elm.
Typical specification for slippery elm inner bark powder
These values reflect published supplier sheets and the official description of the powder. 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 | Ulmus rubra Muhl., inner bark | Microscopy and TLC |
| Country of harvest | Provided with your quote | Supplier declaration |
| Appearance | Fine light tan to light brown powder | Visual |
| Odor and texture in water | Characteristic odor; forms a thick mucilage | Organoleptic |
| Swelling index | Reported on the COA | Ph. Eur. 2.8.4 |
| Foreign matter (outer bark, wood) | NMT 2.0% | USP <561> |
| Particle size | NLT 95% through 80 mesh | USP <786> |
| Loss on drying | NMT 10.0% | USP <731> |
| Total ash | NMT 8.0% | USP <561> |
| Bulk density | 0.40 to 0.60 g/mL | USP <616> |
| Lead | NMT 3.0 ppm | ICP-MS |
| Arsenic | NMT 2.0 ppm | ICP-MS |
| Cadmium | NMT 1.0 ppm | ICP-MS |
| Mercury | NMT 1.0 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 |
| Shelf life | 36 months, unopened | Stability data |
Storage and handling for bulk slippery elm powder
Slippery elm powder reacts quickly with moisture, so dry storage matters more than for most botanicals. 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. The mucilage picks up moisture from the air, and damp powder clumps and stops flowing.
Store cool and dry
Keep bags off the floor in a dry room, away from heat sources and steam lines. Follow the temperature range on the spec sheet.
Control dust
Fine bark powder becomes airborne during scooping and blending. Use local dust extraction and the protective equipment your safety data sheet lists.
Rotate stock
Record the lot number, origin, and retest date for each bag. Send older lots to production first.
Slippery elm inner bark powder buyer FAQ
Quick answers to the questions procurement and quality teams ask most.
Which part of the slippery elm tree is used?
The inner bark is used. The rough outer bark is scraped away before drying, and the remaining inner layer is milled to powder. Your specification and COA should both say inner bark.
Is Ulmus rubra the same as Ulmus fulva?
Yes. Ulmus fulva is an older name for the same tree, Ulmus rubra. Both names appear on documents and labels.
How do you confirm slippery elm identity?
Microscopy confirms inner bark by its starch grains, bast fibers, calcium oxalate crystals, and mucilage cells. A TLC fingerprint compared with a reference adds evidence for the species.
Is slippery elm bark wild harvested?
Most slippery elm bark in the trade is wild harvested, and cultivated supply is small. Ask your supplier how and where each lot was collected.
How does slippery elm powder behave in water?
It thickens quickly and forms a smooth gel. Plan for it in drink mixes and blends, and run viscosity trials at your target concentration.
Where does slippery elm bark come from?
Ulmus rubra is native to the central and eastern United States. If a lot lists another origin, ask for identity evidence before approval. 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.
Request a quote for bulk slippery elm inner bark powder
Tell us your mesh, quantity, and timing. We will reply with current pricing. Select testing documents and sample options on the quote form.
Order Slippery Elm PowderBulk 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.
