Rousselot (Darling Ingredients)
Mukwonago, Wisconsin
Profile updated: April 2, 2026
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 holds FDA GRAS status and 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.
Directory Listing — Records Reviewed
Public records and independent sources have been reviewed.
What this means →Min. OrderMOQ (Minimum Order Quantity)The smallest production run a manufacturer will accept for an order.
Not publicly disclosed
Lead TimeLead TimeThe time from order placement to finished product delivery.
Not publicly disclosed
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
Collagen Peptide Manufacturing (US Facility), Clinical Research Program (Published RCTs), FDA GRAS Collagen Peptides, Pharmaceutical-Grade Gelatin Production, Upcycled Certified Ingredients (2025)
Certifications
0 of 1 certification independently confirmed. What this means
Key Regulatory Concepts
Dietary supplement manufacturers must comply with 21 CFR Part 111 (Current Good Manufacturing Practice for dietary supplements). This includes requirements for personnel, facilities, equipment, production, laboratory operations, and record-keeping.
Review Notes
Collagen peptide brand operated by Darling Ingredients (NYSE: DAR). Peptan collagen peptides backed by published RCTs (skin, bone, sports, metabolic). FDA GRAS status. Upcycled Certified (April 2025). US manufacturing in Mukwonago, WI. Pending merger with PB Leiner into Nextida entity (2026). Darling corporate website, StockTitan merger announcement, and Peptan.com clinical data confirm supplement market role.
Sources
- Darling Ingredients — Rousselot(2026-04-02)
- Darling-Tessenderlo Nextida Merger Agreement(2026-04-02)
Disclosures
- No material connection exists between Inventory Ready and this company
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