Broccoli Seed Extract

00 · Quick grade comparison

Choose Your Starting Point

All nine grades and the separate myrosinase option side by side. Compare the active compound, typical fill weight at a sample target, storage condition and shelf life in one view, then read the relevant section for formulation detail.

Fill weights are formulation arithmetic at the stated assay, not recommended doses. To compare supplier offers, divide landed cost per kilogram by the measured active fraction to obtain cost per kilogram of target compound.

01 · Commercial grades

Broccoli Seed Extract Grades and Supply Formats

PhytoVale offers three glucoraphanin grades and six sulforaphane grades. Glucoraphanin is a glucosinolate precursor, whereas sulforaphane is the corresponding isothiocyanate. The product families are sold against different active-compound assays; they are not interchangeable percentages.

Separate enzyme option: Myrosinase from red cabbage (Brassica oleracea var. capitata f. rubra), with a stated activity specification of ≥220 U/g. Sinigrin-substrate testing is used to characterize enzyme activity; the activity unit and assay conditions are defined in the relevant technical sheet. Myrosinase is a separate ingredient rather than an implied constituent of every GR or SF powder. For enzyme formulation guidance, see Formulating with Myrosinase.

A formulation specifying GR milligrams per serving is generally best compared among the 1%, 10% and 13% precursor grades; when a label concept specifies preformed SF milligrams, the SF range offers a separate choice with different carrier and storage implications.

The USP Broccoli Seed Dry Extract monograph specifies at least 13% GR on the dried basis for the material defined there. Meeting a GR percentage alone does not establish full USP conformity or constitute USP certification.

02 · Bioactive constituents

Key Compounds and the KEAP1–NRF2 Pathway

The biological literature focuses on sulforaphane's interactions with the KEAP1–NRF2–ARE signaling system, a transcriptional pathway involved in cellular responses to electrophilic and oxidative stress. These mechanistic findings describe studied compounds, not clinical efficacy of any finished formulation.

Glucobrassicin is a minor indole glucosinolate that may occur in less purified Brassica extracts. It is not a standardized marker for PhytoVale's listed GR/SF grades.

03 · Product development

Formulation Applications: Match the Grade to the Product

Liver-Related and Phase II Enzyme Research Formulas

For dry capsules developed around the study of glutathione-related and NRF2-regulated pathways, GR 10% and 13% are practical starting points. At an illustrative 50 mg GR target, the 10% grade requires 500 mg of extract and the 13% grade approximately 385 mg — saving about 115 mg of capsule space. A GR-plus-myrosinase formulation can also be explored using the separate ≥220 U/g red-cabbage enzyme, ideally kept dry until use and assessed for both enzyme activity and actual SF formation.^[7]

Antioxidant and Cellular-Defense Supplements

When a formulation specifies a measured amount of preformed SF, the 5% and 10% grades offer a clear manufacturing trade-off. A 5 mg SF target requires approximately 100 mg of a 5% ingredient or 50 mg of a 10% ingredient, calculated from the declared assay before processing losses. The 5% β-cyclodextrin-stabilized option supports ambient-storage supply; the 10% option reduces powder input but specifies −4°C storage. Price comparisons need to account for carrier-related mass, capsule capacity and cold-chain handling, not simply the price per kilogram of powder.

Skin-Health and Cosmetic Research

In a small 2007 human proof-of-concept study, a topical broccoli sprout-derived preparation was associated with reduced UV-induced skin redness at treated sites.^[5] It was not a test of PhytoVale's seed extract, an oral beauty supplement or a finished sunscreen. For cosmetics, identify the correct raw material and INCI name, then confirm carrier compatibility and SF retention in the final formula.

Dosage-Form Compatibility

A manufacturing team should connect the intended compound to actual process conditions before pilot scale.

04 · Carrier and storage

Sulforaphane Stabilization and Storage

PhytoVale's 5% SF β-cyclodextrin-stabilized option is supplied for ambient storage in its sealed, dry packaging. The 10% SF grade specifies −4°C storage. These are grade-specific handling instructions, not a rule that every 5% or 10% sulforaphane material has the same temperature tolerance. The 13% SF option is handled according to its individual grade sheet. All grades carry a 24-month shelf life when stored according to the stated conditions.

The scientific basis for stabilization is well established. Published studies show that inclusion complexes with hydroxypropyl-β-cyclodextrin (HP-β-CD) and maltodextrin-based spray-dried microcapsules can improve SF retention relative to unprotected SF. HP-β-CD and unmodified β-CD are chemically different, so the published result for one material is not an identical performance specification for the other.^[3][4]

For a manufacturer comparing 5% and 10% SF, the central question is not whether one powder is simply "stronger." Doubling the stated SF fraction reduces input mass, but chilled shipment and handling may alter the total cost. For a deeper look at where sulforaphane losses actually occur in manufacturing, see Sulforaphane Stability in Manufacturing.

05 · Typical specification

Quality Specification — GR 13% Grade (Reference)

The table below shows the specification range and a representative batch result for the GR 13% grade, produced by aqueous extraction from broccoli seeds. Other grades follow the same quality framework; request a grade-specific COA for exact limits and test methods.

Physical Description

Chemical Tests

Heavy Metals

Microbiology

Heavy-metal limits shown use the stricter GB national standard. Actual batch results are typically well below stated limits. All grades are non-irradiated. Request a current batch COA for the specific grade and lot number.

06 · Analytical methods

Glucoraphanin, Sulforaphane and Myrosinase: Analytical Testing

PhytoVale lists HPLC-standardized GR grades, HPLC/LC-MS-compatible SF grades and a separate myrosinase option assessed using a sinigrin-substrate activity method. The selected analytical method must distinguish the compound originally present in the powder from SF formed during a deliberate activation test.

Sinigrin-based enzyme methods may quantify substrate disappearance or product formation. A common research definition is the amount of enzyme hydrolyzing 1 μmol of sinigrin per minute under stated conditions; however, U/g should always be interpreted using the method applied to the commercial grade. A 220 U/g value measures catalytic activity under the specified assay and should not be described as 220 mg of SF produced per gram or a fixed conversion percentage.

In a 2026 analytical study, conventional high-temperature GC-MS sample introduction caused over 60% SF degradation under one set of conditions; optimization reduced that degradation to below 1%. The lesson is to use a method validated for SF, rather than treating a technique name alone as a guarantee of accuracy.^[6] For more on testing pitfalls, see Sulforaphane Stability in Manufacturing.

07 · Human research

Myrosinase and Human Sulforaphane Bioavailability

A 2026 randomized, double-blind crossover trial studied 16 healthy adults given 50 mg GR from an extract standardized to at least 13% GR. Adding mustard-seed myrosinase raised mean 24-hour urinary recovery of SF and its metabolites from 18.6% to 39.8%. Both tested preparations also contained vitamin C.^[1]

Urinary metabolite recovery describes the studied product and endpoint, not clinical efficacy or a fixed conversion rate of the separate red-cabbage enzyme option. A 2025 simulated-digestion experiment likewise showed that capsule delivery and formulation ingredients can materially affect SF formation under laboratory conditions.^[2] For practical guidance on building a GR + enzyme formula, see Formulating with Myrosinase.

08 · Safety and responsible use

Safety, Tolerability and Formulation Warnings

Concentrated extracts should not be evaluated as if they were simply a serving of cooked broccoli. Safety assessment needs the actual chemical form, daily proposed intake, concentration, other ingredients and target population. In a 2022 randomized crossover trial of a broccoli seed-and-sprout preparation in 49 smokers, the higher GR-dose period had reports of abdominal pain and diarrhea in 20% of participants each, compared with 2% and 6%, respectively, during the lower-dose period. Reported events were grade 1–2. The figures describe that particular studied preparation, not the adverse-event incidence of each grade offered here.^[7]

Thyroid considerations should be evidence-based rather than alarmist. A 12-week randomized study of a broccoli sprout beverage in 45 women found no significant effect on the thyroid hormone or autoimmunity measures examined. That is reassuring for the tested intervention but cannot establish unlimited-dose safety for all concentrated GR or SF products, or for people with pre-existing thyroid disease.^[8]

No disease-treatment or disease-prevention claim is made for this raw material. Nrf2-related experimental findings and changes in urinary metabolites must not be represented as proof that an untested supplement prevents cancer, treats diabetes or "detoxifies" a person.

09 · Regulatory qualification

US and EU Regulatory Compliance: Check the Exact Grade and Use

"Broccoli" is an ordinary food name; a concentrated, purified or specially stabilized broccoli seed ingredient may present a different regulatory question. There is no responsible single statement that makes all nine grades compliant for every dietary supplement, capsule, gummy or drink in the United States and European Union.

The relevant official starting points are FDA's NDI guidance, FDA's structure/function claims guidance, the EU Novel Food status procedure, the EU food-additive regulation, and the EU health claims framework.

10 · Supply capability and quality systems

PhytoVale Manufacturing and Quality Infrastructure

PhytoVale operates its own extraction, blending and packaging lines in Henan, China, with an annual production capacity of 1,200 metric tons across botanical extract product lines. All broccoli seed extract grades are produced under the same quality management framework and use water as the extraction solvent.

Certifications

Supply and Packaging

11 · PhytoVale technical support

Grade Selection and Documentation for Bulk Buyers

PhytoVale is a factory with its own extraction, blending and packaging capability — not a trading intermediary. Nine standardized grades plus a separate enzyme option cover the three main broccoli-extract development routes (GR precursor, preformed SF, GR + myrosinase) in a single supplier relationship. A 1 kg MOQ allows pilot-scale evaluation before committing to production volumes, and a full certification stack (GMP, ISO 22000, FSSC 22000, HACCP, Halal, Kosher) supports qualification for regulated supplement and food markets worldwide.

We help match the declared compound and concentration to the customer's capsule load, processing conditions, target market and shipping plan. A 5% SF formulation with ambient handling and a 10% grade requiring −4°C can have different total procurement costs even when both deliver the same calculated SF amount.

For technical evaluation, request the current grade-specific COA and assay method, plus the applicable carrier declaration, storage instruction and available quality documentation. Enzyme enquiries can specify the red-cabbage myrosinase ≥220 U/g option and the required sinigrin assay details.

12 · Frequently asked questions

Broccoli Seed Extract FAQs

13 · Selected science

Eight References Supporting the Technical Discussion

These publications support the scientific discussion. Commercial grade details and handling instructions are supplied as PhytoVale product information; the cited studies do not constitute batch-specific COAs or stability certificates. Official USP and regulatory sources are linked in the relevant sections.

[1] Mastaloudis A, et al. (2026). Exogenous myrosinase from mustard seed increases bioavailability of sulforaphane from a glucoraphanin-rich broccoli seed extract in a randomized clinical study. Scientific Reports. DOI: 10.1038/s41598-026-39389-4.

[2] Zhu et al. (2025). Optimization of sulforaphane bioavailability from a glucoraphanin-rich broccoli seed extract in a model of dynamic gastric digestion and absorption by Caco-2 cell monolayers. Food & Function. DOI: 10.1039/D4FO04561K.

[3] Wu H, et al. (2010). Preparation and stability investigation of the inclusion complex of sulforaphane with hydroxypropyl-β-cyclodextrin. Carbohydrate Polymers. DOI: 10.1016/j.carbpol.2010.05.020.

[4] Wu Y, et al. (2014). Stability and encapsulation efficiency of sulforaphane microencapsulated by spray drying. Carbohydrate Polymers. DOI: 10.1039/D4FO04561K.

[5] Talalay P, et al. (2007). Sulforaphane mobilizes cellular defenses that protect skin against damage by UV radiation. Proceedings of the National Academy of Sciences 104(44):17500–17505. DOI: 10.1073/pnas.0708710104.

[6] Melini V, et al. (2026). Sulforaphane Determination by GC-MS Analysis: Mitigation of Thermal Degradation and Quality Evaluation of Two Broccoli-Based Supplements. Molecules 31(15):2598. DOI: 10.3390/molecules31152598.

[7] Bauman JE, et al. (2022). Randomized Crossover Trial Evaluating Detoxification of Tobacco Carcinogens by Broccoli Seed and Sprout Extract in Current Smokers. Cancers 14(9):2129. DOI: 10.3390/cancers14092129.

[8] Chartoumpekis DV, et al. (2019). Broccoli sprout beverage is safe for thyroid hormonal and autoimmune status: Results of a 12-week randomized trial. Food and Chemical Toxicology. PubMed study record.

For professional B2B ingredient evaluation only. Published results relate to the formulations actually studied. The nine listed commercial grades are subject to batch qualification; this page does not assert product-specific carrier composition, enzyme activity, storage life or regulatory approval without supporting documents. Finished-product marketers and importers are responsible for their own formulation, safety, claims and destination-market compliance. © 2026 PhytoVale.