Top 15 Assessed Supplement Contract Manufacturers (2026)

Gemini Pharmaceuticals has produced tablets, capsules, and OTC pharmaceuticals from Commack, New York for over 30 years. The company produces 13 billion dosage units per year and packages over 150,000 bottles per shift. They hold certifications from the FDA, Health Canada, TGA (Australia), and NSF International, making them one of few US contract manufacturers with multi-country registration. Gemini was the first manufacturer to earn RIBUS Certified Contract Manufacturer status for clean label products. They recently received approval for a $25 million expansion supported by Suffolk County IDA incentives. This expansion includes a new probiotic supplement facility at 81 Modular Avenue. Their 300,000 unit minimum order signals they serve mid-to-large brands, not startups. The ISO 17025 accredited in-house laboratory handles identity testing, potency analysis, and stability studies.

Lief Labs operates over 220,000 sq ft of manufacturing space across two FDA-registered facilities in Valencia, California. The company holds USDA Organic certification and an ISO/IEC 17025 accredited microbiology lab. This in-house testing capability is unusual for contract manufacturers and allows faster quality control turnaround. They produce over 5 million capsules and 1 million tablets per day. Lief Labs was one of the first contract manufacturers to earn NSF International cGMP certification, holding it since 2010. Their product line includes organic-approved tablets, a category few competitors offer. The company also provides Non-GMO Project verification assistance for brands seeking that certification. They target emerging and entrepreneurial brands with minimum orders starting at 2,500 units.

Robinson Pharma operates over 1 million sq ft of manufacturing space across eight to nine facilities in Santa Ana and Costa Mesa, California. Founded in 1989, the company has the largest softgel production capacity in the United States. Their facilities produce 23 billion softgels, 7 billion gummies, and 5 billion tablets and capsules per year. Robinson Pharma holds certifications from NSF, UL, Eurofins, and carries ISO 9001:2015 and SQF credentials. They are one of few contract manufacturers with both USDA Organic and USP certification. The company recently expanded with new high-speed liquid production lines and additional tablet capabilities. They serve brands that need high-volume production runs with claims of the shortest lead times in the industry. Their facility count has grown from seven to nine buildings in recent years, funded partly by a $40.7 million property acquisition.

Best Formulations has manufactured dietary supplements and softgels from City of Industry, California since 1984. The company was acquired by Sirio Pharma in 2023 and now operates as Sirio Americas. This gives them access to a global network spanning Asia and Europe. Best Formulations is one of the largest plant-based softgel manufacturers in the United States. They specialize in difficult paste-style softgel formulas and probiotic handling. The company holds an FDA drug license, which is a higher regulatory standard than standard dietary supplement registration. Their four Southern California facilities total over 120,000 sq ft. They also hold NPA GMP certification and NSF GMP for Sport designation, making them suitable for sports nutrition brands. The Sirio acquisition brings institutional-grade resources but may add corporate complexity for smaller brands.

Captek Softgel International (CSI) specializes in softgel and gummy manufacturing from facilities in Cerritos, Vista, and La Mirada, California. Founded in 1996, the company employs roughly 700 people and has produced over 4,000 formulations. They developed MarineGel, a marine-sourced softgel alternative to traditional bovine and porcine gelatin. This product is naturally suited for Halal and Kosher markets. Captek operates an SQF-certified 60,000 sq ft gummy facility in La Mirada with a starch-free production line. They hold NSF GMP and NSF GMP for Sport certifications. The company maintains over 160 bulk stock SKUs with low minimum order quantities for brands that want to launch quickly. Captek received private equity investment from Swander Pace Capital, signaling financial stability and growth capacity. They are one of the largest independent softgel contract manufacturers in the United States.

Vitaquest International has manufactured dietary supplements for over 40 years from its three facilities in West Caldwell, New Jersey. The company was the first nutraceutical manufacturer in the United States to earn FSSC 22000 certification. They hold USP Quality Systems GMP verification, a higher standard than typical cGMP compliance. Vitaquest serves over 500 brands globally and produces more than 4,000 products. Their capabilities include specialty dosage forms like effervescent tablets, orally disintegrating tablets, and microencapsulated ingredients. A dedicated particle engineering facility handles complex formulations that most manufacturers cannot produce. The company employs 500 to 700 people and produces roughly 3 billion capsule doses and 2 billion tablet doses per year. Lead times run 12 to 16 weeks for first-time orders, longer than smaller manufacturers but typical for this scale of operation.

JW Nutritional operates over 120,000 sq ft of manufacturing space across two facilities in Allen, Texas. Founded in 2004 by Jesse Windrix while in college, the company has grown into a full-service contract manufacturer. They hold NSF GMP registration and NSF Certified for Sport designation. JW Nutritional employs research scientists, flavor specialists, and chemists for in-house formulation development. The company covers all major dosage forms and includes liquid supplements and effervescent tablets in their capabilities. They position themselves as an actual manufacturer rather than a broker, which is a useful distinction in an industry where some companies outsource production. JW Nutritional received an FDA warning letter in 2015 for cGMP violations. The FDA issued a resolution letter in 2017 confirming all violations were addressed. The company is BBB accredited and markets to both startup and established brands.

NutraScience Labs brings over 50 years of nutraceutical manufacturing experience from its facilities on Long Island, New York. The company is a subsidiary of Twinlab Consolidation Corporation (OTCPK: TLCC). They specialize in powder flavoring and offer a wide range of dosage forms. Their NSF-certified cGMP status has been renewed consistently across both east and west coast manufacturing sites. Every account receives a dedicated manager available around the clock. The company handles everything from formulation through packaging and fulfillment. NutraScience Labs is known for producing custom powder blends with complex flavor profiles. They provide 48-hour turnaround on price quotes for new projects.

Supplement Manufacturing Partners (SMP Nutra) operates a 155,000 sq ft facility in Largo, Florida. The company holds NSF 455-2 certification and manufactures over 800 stock products for private label customers. Their products have appeared on shelves at Walmart, Target, The Vitamin Shoppe, and GNC. SMP Nutra offers one of the most accessible entry points for new brands. Stock products start at 1,000 bottles, and custom manufacturing begins at 1,500 to 2,000 bottles. The company recently relocated its headquarters from New York to Pinellas County, Florida, with a ribbon-cutting ceremony covered in industry press. SMP Nutra covers all major dosage forms and provides full-service manufacturing from formulation through finished product. Their stock catalog lets brands launch quickly while custom formulation serves those with unique products.

Bactolac Pharmaceutical operates 650,000 sq ft of manufacturing space in Hauppauge, New York. Founded in 1995, the company is one of the largest full-service supplement manufacturers on Long Island. They handle every step in-house, from product development through final packaging and label application. Bactolac holds certifications from NSF, UL, NPA, and QAI (USDA-accredited organic certifier). Their product range covers standard capsules and tablets as well as specialty formats like sublingual tablets, enteric-coated capsules, and stick packs. The company has developed expertise in emerging supplement categories including nootropics, longevity products, and pet supplements. They can support brands seeking NSF for Sport, organic, or Non-GMO Project verification for their finished products. Their in-house testing lab runs quality control without relying on outside laboratories.

Makers Nutrition operates a 177,000 sq ft FDA-registered facility in Commack, New York. They focus on startups and emerging brands with some of the lowest minimum order quantities in the industry. Their turnkey model covers every step from formulation through fulfillment. The company offers over 100 stock formulas for private label products. Custom formulation is available for brands that need unique products. Their NSF-certified cGMP facility can produce up to 200,000 bottles per day. Design services include label creation and packaging. They also handle warehousing and order fulfillment for direct-to-consumer brands. Founded in 2014, they have grown quickly by serving brand owners who are launching their first supplement products.

Summit Rx operates a 47,000 sq ft FDA-registered facility in Bayonne, New Jersey. Founded in 2012 by pharmacist Sam Salia, the company brings a pharmaceutical perspective to supplement manufacturing. They hold USDA Organic certification and maintain ISO Class 8 cleanroom suites with HEPA filtration, which exceeds what most supplement manufacturers offer. Summit Rx specializes in organic supplement production with capabilities across gummies, capsules, and custom-blended powders. They advertise low minimum order quantities and flexibility for both small and large batch production. The pharmacist-led approach means formulations go through clinical review before production. The company markets to both emerging brands and established companies looking for organic-certified manufacturing.

GMP Laboratories of America is a contract manufacturer of dietary supplements and homeopathic drug products based in Anaheim, California, operating since 1994. The company runs two facilities totaling over 100,000 square feet within the Anaheim Center for Advanced Technology. GMP Labs produces capsules, tablets, powders, liquids, and gummies, with a stated hard-shell encapsulation capacity exceeding 400 million capsules per month. The company holds USDA Organic certification through CCOF and claims NSF GMP for Sport registration. GMP Labs offers end-to-end services from custom formulation and R&D through manufacturing, packaging, and labeling, including Amazon FBA-compliant packaging and blister card packaging.

Rose City Nutritionals is a contract manufacturer of dietary supplements founded in 2019 and based in Vancouver, Washington. The company operates a 50,000-square-foot, climate-controlled facility equipped with eight high-speed encapsulation and packaging machines, producing two-piece capsules, uncoated tablets, and powders. Rose City Nutritionals is FDA-registered (FEI 3015539859) and received one Form 483 during its only FDA inspection in September 2023, with no warning letters issued. The company claims NSF and UL certifications on its website, though neither could be independently verified through public directories as of March 2026.

Kelker Pharma, Inc. is a contract manufacturer of dietary supplements based in Riverside, California, operating from a 75,000-square-foot facility. Founded by Tariq Kelker, M.D. (a trauma surgeon and formulation specialist), the company manufactures capsules, tablets, powders, and nutritional bars for brands in sports nutrition, weight management, and general health. The company reports a production capacity of 10 million capsules and 5 million tablets per day. In 2025, Kelker launched its own consumer brand, NUTRILINQ, focused on nutritional support for GLP-1 medication users. Kelker claims cGMP, FDA registration, USDA Organic (via Oregon Tilth), and NSF GMP/Sport certifications, though none were independently verified through third-party directory searches.