Wholesome in bulk™ Soy Protein Isolate Powder
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Bulk Soy Protein Isolate Powder for Supplement and Food Manufacturing
Soy protein isolate is a fine, off white powder made from dehulled, defatted soybeans (Glycine max (L.) Merr.), with protein stated at 90% or more on a moisture free basis. It is made by dissolving the protein out of defatted soy flakes, separating it from the fiber, then drying it. Soy is a major food allergen in the US, so finished labels must declare it. We supply it in bulk to supplement brands, contract manufacturers, and food formulators. You can request testing documents and samples on the quote form.
A plant protein with a clear grade system and known label rules
Soy protein isolate is sold on a stated protein number with standard test methods. Makers also sell types that differ in viscosity, density, and dispersibility. That lets you match the grade to your format and compare suppliers on the same footing.
A defined protein level
Isolates are sold at 90% or more protein on a moisture free basis. Protein is measured as nitrogen multiplied by 6.25, usually by Kjeldahl or Dumas combustion.
A simple grade ladder
Defatted soy flour runs about 50 to 54% protein, and soy protein concentrate about 65 to 70%. Isolate sits at the top, so less powder delivers the same protein grams.
Isolate types for each format
Makers sell isolates by viscosity, dispersibility, density, and solubility, plus hydrolyzed grades. Low viscosity types suit shakes, and high density types suit bars and tablets.
Water based isolation
The protein is dissolved out of defatted flakes in mildly alkaline water and separated from fiber by centrifuge. It is then recovered and spray dried. The flakes are usually defatted with hexane, so ask about the solvent.
Neutral color and taste
Good lots are off white to cream with a neutral taste and little odor. Fine grades pass a 100 mesh screen almost completely, which suits drink mixes and scoop filled tubs.
Allergen and GMO paperwork
Soy is a declared major allergen in the US, so the label rule is settled. Buyers who need non-GMO material ask for identity preserved documents that track the beans from field to plant.
Where formulators use soy protein isolate
Soy protein isolate fits powder, bar, and food formats where protein grams per serving are measured, including:
- Protein powders
- Powdered drink mixes
- Sports nutrition powders
- Meal replacement shakes
- Protein bars
- Compressed tablets
- Plant based beverages
- Baked goods and snacks
- Plant based meat alternatives
- Private label programs
Pick the isolate type before you pick the supplier. A low viscosity isolate made for shakes can feel thin in a bar, and a high density bar grade can thicken a drink. Base your protein math on the protein result and basis shown on each COA.
What to check before you buy soy protein isolate
Two powders sold as 90% soy protein can differ in basis, isolate type, GMO status, and allergen paperwork. Review these points together, and ask for lot documents before you approve a supplier.
Protein basis and method
Ask for protein as N x 6.25 on a dry basis, with the method named. A figure labeled 'assay' or 'purity' with no basis is not a protein result.
Isolate type
Ask for viscosity, dispersibility, and solubility data, or the maker's grade description. Match the type to your format before you compare prices.
Non-GMO documents
If your label or customer needs non-GMO, ask for the identity preserved certificate chain and a PCR test result for the lot. A non-GMO line on a spec sheet is not proof on its own.
Allergen statement
Ask for a written allergen statement that names soy and lists any other major allergens handled on the same lines. Check it against your own allergen controls.
Solvent and added aids
Ask how the flakes were defatted, and whether lecithin or another processing aid was added for dispersibility. Request residual solvent results if your brand specifies them.
Metals, micro, and origin
Ask for measured lead and cadmium by ICP-MS, microbial results, and the countries where the beans were grown and processed. Spec limits differ widely between makers.
Serving math: Protein powders are used at 20 to 30 g per serving, so small ppm figures add up. At a 30 g serving, each 0.1 ppm of lead equals 3 micrograms per serving. Use measured lot results and your own finished product testing to set your limit.
Typical specification for soy protein isolate
These values reflect a common 90% isolate grade. 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 |
|---|---|---|
| Source | Soybean, Glycine max (L.) Merr., dehulled and defatted | Supplier declaration |
| Appearance | Fine off white to cream powder | Visual |
| Odor and taste | Neutral, no off odors | Organoleptic |
| Protein (N x 6.25, dry basis) | NLT 90.0% | Kjeldahl or Dumas combustion |
| Moisture | NMT 7.0% | USP <731> |
| Ash (dry basis) | NMT 6.0% | Gravimetric (AOAC) |
| Fat | NMT 1.0% | AOAC |
| pH | 6.5 to 7.8 | USP <791> |
| Particle size | NLT 98% through 100 mesh | USP <786> |
| Isolate type | Grade named on the specification sheet, with viscosity or solubility data | Supplier data sheet |
| GMO status | Non-GMO, identity preserved, with PCR result | IP certificates and PCR test |
| Allergen | Contains soy | Allergen statement |
| Lead | NMT 1.0 ppm, with measured value | ICP-MS |
| Cadmium | NMT 0.2 ppm, with measured value | ICP-MS |
| Arsenic | NMT 0.5 ppm | ICP-MS |
| Mercury | NMT 0.2 ppm | ICP-MS |
| Total aerobic count | NMT 10,000 cfu/g | USP <2021> |
| Yeast and mold | NMT 100 cfu/g | USP <2021> |
| E. coli and Salmonella | Negative in 10 g and 25 g | USP <2022> |
| Shelf life | 12 to 24 months, unopened | Stability data |
Storage and handling for bulk soy protein
Protein powders keep well when they stay sealed, dry, and away from strong odors. Soy also needs allergen controls in your plant, so plan storage and cleaning around it.
Keep it sealed
Close the inner liner after each use and press out the air. Protein powder picks up moisture from the air and can clump when left open.
Store cool and dry
Keep bags off the floor in a dry room, away from heat and large swings in humidity. Follow the temperature range on the spec sheet.
Separate allergen stock
Store soy apart from materials for soy free products and mark each bag with an allergen tag. Clean scoops, blenders, and fillers between soy runs and soy free runs.
Control dust and rotate stock
Scoop gently and use local dust extraction at the blending station. Record the lot number and retest date for each bag, and use older lots first.
Soy protein isolate buyer FAQ
Quick answers to the questions procurement and quality teams ask most.
What is the difference between soy protein isolate and concentrate?
The difference is protein level. Isolates contain 90% or more protein on a moisture free basis, while concentrates contain about 65 to 70%. Concentrates keep more of the soybean's fiber, so isolates are the usual pick for protein powders.
How is the protein percentage measured?
Protein is measured as total nitrogen multiplied by 6.25, using the Kjeldahl or Dumas method. Check whether the COA reports it on a dry basis or as is, because the as is figure includes the moisture in the powder.
Is soy a major food allergen?
Yes. Soy is one of the nine major food allergens under US law, so finished products must declare it on the label. Ask for the allergen statement and cross contact details for each lot.
Is your soy protein isolate non-GMO?
Non-GMO status depends on the lot and must be backed by documents for that lot. Non-GMO isolate comes from identity preserved soybeans that stay separate from field to plant and are checked by PCR testing. Non-GMO and identity preservation documents may be available depending on the lot, so please confirm with us before you order.
Is soy protein isolate made with hexane?
Most soy protein starts from soybean flakes defatted with hexane, and the isolate itself is then made in water. Ask for the defatting method and residual solvent results if your brand specifies them.
Which grade suits powdered drinks?
Low viscosity, readily dispersible grades are the usual choice for shakes and drink mixes. High density grades with low water binding suit bars and tablets. Test a sample in your own base before you scale up.
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 soy protein isolate
Tell us your protein grade, isolate type, GMO paperwork needs, quantity, and timing. We will reply with current pricing. Select testing documents and sample options on the quote form.
Order Soy Protein IsolateBulk 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 food 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.
