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Watermelon Seed Protein Powder
Product Introduction
Watermelon seed protein powder is extracted from the seeds of *Citrullus lanatus* (watermelon), a member of the Cucurbitaceae family. Our raw seeds are sourced from contract-growing regions in Northwest China (Xinjiang and Gansu), where abundant sunlight and low humidity produce seeds with naturally high protein content and minimal microbial load. The seeds are separated from the pulp during watermelon juice processing—making this ingredient a valorized by-product that aligns with circular-economy principles.
Fine, free-flowing powder with a **light yellow to off-white** color. The 60%+ protein grades exhibit a cleaner, paler appearance due to reduced fiber and lipid content. Odor is characteristic of roasted watermelon seed, mild and non-offensive—an advantage over pea protein's beany aftertaste.
Specifications Available:
- Protein content: 40% / 50% (N × 6.25, dry basis)
- Standard grade: 60% protein (most popular for food & beverage applications)
- Custom specifications available upon request
product benefits
Complete Amino Acid Profile with Exceptional Arginine Content
Watermelon seed protein stands out among plant proteins for its arginine-rich amino acid profile. Published compositional data shows arginine at approximately 2.47 g/100 g in whole seed powder, with concentrations significantly elevated in protein concentrates (60%+ grade). Arginine serves as the physiological precursor to nitric oxide (NO), a key signaling molecule supporting vascular health, blood flow, and exercise recovery.
The protein also delivers meaningful levels of glutamic acid(the most abundant amino acid, ~54.87 mg/g in protein concentrate), aspartic acid (~18.86 mg/g), and branched-chain amino acids (leucine ~13.92 mg/g, valine ~9.12 mg/g, isoleucine). While lysine is the first limiting amino acid (consistent with most seed proteins), this is readily addressed through formulation blending with complementary proteins such as pea or rice protein.
Naturally Contains L-Citrulline
Unlike most plant protein isolates, watermelon seed protein retains L-citrulline, a non-essential amino acid that acts as the rate-limiting precursor for endogenous arginine synthesis via the urea cycle. L-citrulline is more efficiently converted to arginine in the body than oral arginine itself, making this ingredient a dual-action protein + nitric-oxide-support raw material—particularly valuable for sports nutrition and cardiovascular health formulations.
Hypoallergenic & Clean-Label Advantage
Watermelon seed protein is naturally free from the top allergens that affect a large segment of consumers: no soy, no dairy, no gluten, no tree nuts, no peanuts. For brands formulating for allergen-sensitive consumers or seeking "free-from" label claims, this ingredient offers a clean-label protein source without the beany off-flavor of soy or the earthy bitterness of pea protein. Its mild, neutral taste profile reduces the need for masking flavors in finished products.
Rich in Micronutrients & Antioxidants
Beyond protein, watermelon seeds contain magnesium, zinc, iron, and phosphorus, along with phenolic compounds (including quercetin, apigenin, luteolin, and rutin) that contribute to antioxidant activity. Research published in *Food & Function* (RSC, 2025) and PMC (2024) confirms the antioxidant and functional properties of watermelon seed protein concentrates, with DPPH radical-scavenging activity comparable to other commercially available seed proteins.
Applications
Sports Nutrition & Performance Products
Protein powders & blends: Standalone or blended with pea/rice protein for pre- and post-workout formulations
Ready-to-drink (RTD) protein beverages: Instantized grade (≥95% solubility) for clear or cloudy beverages
Energy & recovery bars: Excellent binding and texture; arginine + citrulline support blood flow and recovery
Pre-workout formulas: Natural nitric-oxide support via arginine and L-citrulline content
Plant-Based & Vegan Food Products
Meat analogs & plant-based meats: Protein fortification, emulsification, and texture improvement
Dairy alternatives: Plant-based milk, yogurt, and cheese formulations—creamy mouthfeel without dairy
Vegan protein supplements: Clean-label, allergen-free protein source for the growing vegan market
Functional Foods & Beverages
Meal replacement shakes & smoothies: High protein + fiber + micronutrients in a single ingredient
Baked goods & snacks: Bread, muffins, cookies, protein-enriched pasta, and extruded snacks
Breakfast cereals & granola: Protein fortification without compromising crisp texture
Soups & sauces: Natural thickening agent with nutritional enhancement
Nutraceuticals & Dietary Supplements
Capsules & tablets: Protein-based supplement for general wellness, cardiovascular support, and muscle maintenance
Powdered supplement blends: Multi-ingredient formulations targeting blood pressure support, immune health, and athletic performance
Weight management products: High satiety protein with low caloric density
Pet Food & Animal Nutrition
Plant-based pet food: Protein source for vegan/vegetarian dog and cat food formulations
Pet supplements & treats: Protein fortification for functional pet treats and nutritional supplements
Aquafeed: Sustainable protein alternative in fish feed formulations
Cosmetics & Personal Care
Skincare formulations: Protein-based film-forming agents for anti-aging and moisturizing products
Hair care: Protein treatments for strengthening and repairing damaged hair
Natural cosmetics: Clean-label, plant-derived protein for "free-from" cosmetic brands
customer cases
Note: Brand names are withheld under NDA. The following represent real application scenarios and technical solutions delivered to our B2B partners.
Case Study 1: European Sports Nutrition Brand — Plant-Based Protein Powder Line
A fast-growing European sports nutrition brand wanted to launch a vegan protein powder line that differentiated itself from the crowded pea-protein market. They needed an ingredient with a cleaner taste profile, natural nitric-oxide support, and strong "free-from" credentials.
We supplied our 70% Watermelon Seed Protein Isolate as the core protein source, blended with organic pea protein (70:30 ratio) to optimize the amino acid score. Our R&D team provided a custom instantization treatment (agglomeration with sunflower lecithin) to achieve ≥95% solubility in cold water, eliminating the gritty texture common in seed proteins.
The product launched in 2025 across 12 EU countries. Consumer testing scored the taste 4.3/5 (vs. 3.6/5 for their previous pea-only formula), and the "naturally contains L-citrulline & arginine" claim became the top-performing marketing message. Repeat purchase rate increased by 28% in the first 6 months.
Case Study 2: North American Plant-Based Meat Startup — Protein Fortification & Texture Optimization
A plant-based meat startup needed to boost the protein content of their chicken-style product from 12g to 18g per serving while maintaining a fibrous, meat-like texture. Soy protein isolate was rejected due to allergen concerns and GMO perceptions.
We provided our 60% Watermelon Seed Protein Concentrate at 8% inclusion rate, combined with a textured wheat protein base. Our technical team conducted extrusion trials at our pilot facility, optimizing moisture (55%), temperature (140°C zone 3), and screw speed (350 rpm) to achieve the desired fibrous structure. The watermelon seed protein's emulsifying properties improved fat distribution and reduced syneresis during cooking.
Final product achieved 18.5g protein per serving with 0g trans fat and no soy allergen declaration. Cooking loss reduced from 18% to 11%, and the product passed 90-day frozen storage stability testing. The brand secured distribution with a major US grocery chain in Q2 2025.
FAQ
Q: Is Watermelon Seed Protein a complete protein?
A: Watermelon seed protein contains all essential amino acids, but lysine is the first limiting amino acid (as with most seed proteins). It is not considered a "complete protein" by the strict PDCAAS = 1.0 standard on its own. However, it is exceptionally rich in arginine, glutamic acid, and BCAAs. For formulations requiring a complete amino acid profile, we recommend blending with pea or rice protein (we offer pre-blended options). The natural L-citrulline content is a unique differentiator not found in other plant proteins.
Q: Does Watermelon Seed Protein Powder contain common allergens?
A: No. Our Watermelon Seed Protein Powder is naturally free from all major allergens: no soy, no dairy, no gluten, no tree nuts, no peanuts, no eggs, no fish, no shellfish, no sesame.
Q: What does Watermelon Seed Protein Powder taste like?
A: It has a mild, neutral, slightly nutty-sweet flavor characteristic of roasted watermelon seeds. Unlike pea protein (earthy/beany) or soy protein (bitter/beany), watermelon seed protein requires minimal flavor masking.
Q: Is Watermelon Seed Protein Powder soluble in water?
A: Standard grade has approximately 80–85% solubility. For beverage applications requiring full clarity or no sedimentation, we offer an **instantized grade** (agglomerated with sunflower lecithin) with ≥95% solubility in both cold and warm water. We also offer micronized grades (100–200 mesh) for ultra-smooth mouthfeel in RTD beverages.
Q: What are the heavy metal limits, and do you provide third-party test reports?
A: Our specifications are: Pb ≤ 3.0 mg/kg, As ≤ 1.0 mg/kg, Cd ≤ 1.0 mg/kg, Hg ≤ 0.1 mg/kg. These meet or exceed FDA, EU, and Codex Alimentarius standards for plant-based protein ingredients. Every batch comes with an in-house COA. For bulk orders (≥500 kg), we provide complimentary third-party reports from SGS or Eurofins. For smaller orders, third-party testing is available at cost.
Q: What is the minimum order quantity (MOQ)?
A: For production orders: 25 kg (1 fiber drum). For custom manufacturing (custom protein grade, particle size, or blends): 500 kg. For private label retail packaging: 1,000 units.
Q: Do you offer private label or custom packaging?
A: Yes. We offer custom packaging including: 1 kg / 5 kg / 10 kg foil bags (with your brand artwork), 25 kg fiber drums (custom labels), and retail-ready packaging (tubs, pouches, stick packs) for supplement brands.
KH Health is your trusted partner, dedicated to listening to customers, solving every problem, and providing quick responses. For any questions or assistance regarding watermelon seed protein powder, feel free to contact us via:
Email: sales@kh-health.com
WeChat: +86 13096987266
WhatsApp: +86 18792880979
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