Rousselot (Darling Ingredients)
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.
Mukwonago, Wisconsin
Directory Listing · Records Reviewed
Public records and independent sources have been reviewed.
What this means →- MOQMOQ (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
§1Editorial assessment
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.
§2Our review
The six checks in our review, applied before any name appears in the directory. Each check is auto-derived from public evidence on this profile.
§3Inspection history
§4Certifications
Certification verification in progress. International supplier records require regional database lookups (EudraGMDP, Health Canada NHP, FSSC public register, JHFA directory). See our methodology.
§5Capability matrix
- 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)
§6Sources
- Darling Ingredients — Rousselot(2026-04-02)
- Darling-Tessenderlo Nextida Merger Agreement(2026-04-02)
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.
Disclosures
- No material connection exists between Inventory Ready and this company
For the check-by-check breakdown that produces this vendor's score, see our scoring framework. The connection map between Rousselot (Darling Ingredients) and other vendors, capabilities, and certifications is in the manufacturer atlas.
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