Oak Bark Extract Powder

Oak bark extract starts from the bark of Quercus robur, the pedunculate or English oak, with the wood, acorn and leaf excluded. Water extraction concentrates the soluble bark fraction, and the liquor is dried into a light brown powder that disperses in water.

The extract is supplied at a 10:1 ratio with no marker percentage and is milled to 80 mesh. It is a tannin-led bark profile. Cork oak bark and white oak bark come from other species and are not part of this entry.

SKU: BOT-BEX-0472 Category: Botanical Extracts Tags: Bark & Stem, Gummies & Chews, Plant Extracts, Sports Nutrition, Water Dispersible, Water Extracted

Quercus robur Bark Source & Identity

The botanical entity is Quercus robur L., the pedunculate oak of the Fagaceae, a long-lived deciduous tree with lobed leaves and acorns carried on stalks. The part used is the bark. Wood, acorn and leaf are not part of this oak bark extract.

Several oak barks are traded, and they differ in tannin profile. White oak is Quercus alba and cork oak is Quercus suber, so the Latin binomial should appear on every specification. The bark of Quercus robur is rich in ellagitannins such as castalagin and vescalagin, together with ellagic acid and catechins, which are named here only as families and not as percentages.

What 10:1 Means for Oak Bark

Tannin-rich bark yields a strongly colored, astringent liquor, and drying concentrates that profile in the powder. The 10:1 ratio expresses the concentration against the starting bark and carries no tannin figure, so the oak bark extract is described by species, part and ratio. Tannin content is a different parameter that depends on tree age, bark layer and method, and a buyer who needs it declared has to look at a defined grade. None is listed for Quercus robur, and no powder form sits beside this extract.

Typical Specifications

Specification Item	Product Information
Latin Name	Quercus robur
Plant Part	Bark & Stem
Processing	Water Extraction
Common Name	English Oak Bark
Ingredient Type	Ratio Extract
Extract Ratio	10:1
Appearance	Light brown powder
Solubility / Dispersibility	Water Dispersible
Quality Parameters
Moisture (LOD)	≤5.0%
Total Ash	≤5.0%
Particle Size	80 mesh
Heavy Metals	Lead ≤2 ppm · Arsenic ≤1 ppm · Cadmium ≤1 ppm · Mercury ≤0.1 ppm
Microbiology	TPC ≤1,000 cfu/g · Yeast & Mold ≤100 cfu/g · E. coli Negative · Salmonella Negative/25 g
Shelf Life	24 months in unopened original packaging, cool and dry storage

Application Areas

Capsules for Astringent Extracts

Oak bark extract fills into capsules as a light brown powder with a strong dry astringency. Capsules keep the taste off the tongue. Tannin dust is sticky, so a flow aid and a dry filling room help fill weights stay steady.

Tablet Blends Away from Iron

Ellagitannins form dark complexes with iron, so oak bark extract tablets are compressed on stainless surfaces and kept clear of iron-bearing excipients. Microcrystalline cellulose and a disintegrant carry the powder, and a film coat masks the astringent taste.

Brown Drink Powders

Drink powders use the oak bark extract at low levels, where the liquid turns a reddish tan and astringency limits the dose. Sweeteners and a fruit acid soften the dry finish, and the finished drink is tasted cold.

Sachets with Carriers

Sachets blend the extract with a carrier so that the dose stays level pack to pack. Tannin extracts clump readily, so the premix is dried and the sachet seal is checked for moisture during filling.

Tannin-Tolerant Gummies

Cooked gummies take the extract late in the base, because tannins interact with gelatin and pectin and can toughen the gel. Dark fruit flavors cover the tint, and viscosity and texture are checked in trials before scale-up.

Formulation Notes

Oak bark extract is a light brown powder with a faint woody aroma and a dry, strongly astringent taste. In water it forms a reddish tan liquid that may turn cloudy on cooling as tannins associate. The astringency is the main sensory constraint and caps the inclusion level in drinks.

Tannins react with iron and with proteins, so the powder darkens on contact with iron equipment and may haze in protein drinks. Weigh the oak bark extract in a dry area, reseal the liner after each draw and keep it away from heat and light. Surface clumping signals that moisture has reached the pack.

Keep oak bark extract away from iron surfaces from weighing to filling, and clean stainless equipment before the next product, because tannin residue stains. Dry-blend with a carrier, screen once and fill promptly. In protein drinks, run a haze test before scale-up, since tannins bind proteins and form a cloud.

Packaging & Commercial Supply

Essencefield supports product evaluation, formulation trials, commercial orders, and ongoing ingredient supply. Packaging, storage, and shipping arrangements are determined by product characteristics, order quantity, stability requirements, and destination-market needs.

Supply Item	General Information
Sample	Available upon request for formulation, testing, and supplier evaluation
Order Quantities	100 g · 1 kg · 5 kg · 25 kg · 100 kg · 500 kg · Bulk
Sample Lead Time	Typically 5–7 days after sample confirmation
Production Lead Time	Typically 15–30 days after order and specification confirmation
Packaging	Suitable protective inner packaging with bags, cartons, drums, or other appropriate outer packaging
Storage	Store in tightly sealed, suitable protective packaging in a cool, dry environment. Protect from moisture, heat, and direct sunlight. Specific storage conditions follow the approved product specification.
Documentation	COA · Product Specification · TDS · SDS · Applicable declarations (as applicable)

Final order quantities, lead times, packaging, documentation, and shipping arrangements are confirmed according to the selected product and commercial requirements.