Rousselot (Darling Ingredients)
Maker of gelatin and collagen peptides, including branded peptide ingredients.
- MOQ
- Not publicly disclosed
- LEAD TIME
- Not publicly disclosed
Overview
Rousselot is a gelatin and collagen peptide brand operated by Darling Ingredients, Inc. (NYSE: DAR), an American company headquartered in Irving, Texas. Rousselot's flagship supplement ingredient is Peptan, a range of collagen peptides backed by published randomized controlled trials for skin health (85-person RCT showing wrinkle reduction), hair strength (13% increase vs. placebo), bone density, sports recovery (20% less muscle soreness at 20g/day), and metabolic health. Rousselot operates a US manufacturing facility in Mukwonago, Wisconsin. Peptan received Upcycled Certified designation in April 2025. Note: Rousselot is merging with PB Leiner (Tessenderlo Group) into a new entity called Nextida, expected to close in 2026.
Certifications
Certification verification in progress. International supplier records require regional database lookups (EudraGMDP, Health Canada NHP, FSSC public register, JHFA directory). See our methodology.
Capabilities
- PRODUCT TYPES
- Peptan Collagen Peptides (Skin Health) · Peptan Collagen Peptides (Bone Health) · Peptan Collagen Peptides (Sports Recovery) · Peptan Collagen Peptides (Metabolic Health) · Pharmaceutical-Grade Gelatin · Collagen-Based Excipients
- CAPABILITIES
- Clinical research or study support · Collagen, proteins or peptides · Sustainability programs · Pharmaceutical-grade production · US production
Sources
- Darling Ingredients — Rousselot(2026-04-02)
- Darling-Tessenderlo Nextida Merger Agreement(2026-04-02)
What we couldn't verify
We did not visit this company on site. See the limits that apply to every listing.
- Not a standalone entity. Rousselot is a brand/division of Darling Ingredients, Inc. (NYSE: DAR, Irving, TX)
- Pending merger with PB Leiner (Tessenderlo Group) into new entity 'Nextida'. Expected to close in 2026; corporate structure may change
- Projected combined Nextida entity: ~$1.5B revenue, 200,000 metric tons capacity, 22 facilities worldwide
- Certification details beyond cGMP and FDA GRAS not independently verified from public databases
Dietary supplement manufacturers must comply with 21 CFR Part 111 (cGMP). What Part 111 requires
The connection map between Rousselot (Darling Ingredients) and other vendors, capabilities, and certifications is in the manufacturer atlas.
Enforcement screening: included in Inventory Ready's most recent completed pass against FDA's published recall datasets (2026-07-09). Method and limits →
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