Why Peptan®
Why Peptan®
Our hero ingredient
Why Peptan®? The science behind our collagen
We chose Peptan® collagen peptides from Rousselot because the ingredient is backed by published human research, made to strict quality standards and halal certified. Here is what that research says, and how we use it.
Evidence before marketing
Many collagen products use generic, unbranded collagen with no research of its own. Peptan® is different: Rousselot has funded and published clinical studies on its own ingredient over more than a decade, working with independent dermatology and research laboratories in France, Japan, Germany, Brazil and China.
What is Peptan®?
Peptan® is a hydrolysed collagen: collagen broken down into small peptides through a controlled enzymatic process. Smaller peptides dissolve easily and can be absorbed by the body. Rousselot makes Peptan® from bovine, porcine and fish sources; Nutrian's Collagen+ uses bovine Peptan®, produced in Angoulême, France and halal certified.
What the research on Peptan® found
The studies below were carried out on the Peptan® ingredient (from different source materials) at the doses shown. They were not studies of Nutrian products.
Skin: 12-week study, 85 women
A randomised, double-blind, placebo-controlled trial in East Asian women aged 40–65 (Vleminckx et al., Journal of Cosmetic Dermatology, 2024). Participants took 5 g of Peptan® daily for 12 weeks. Compared with placebo, researchers reported significant improvements in skin density, elasticity and hydration, and reduced wrinkle depth.
Skin hydration and the collagen network
Two placebo-controlled trials and laboratory work (Asserin et al., Journal of Cosmetic Dermatology, 2015) used 10 g of Peptan® daily.
Visible signs of ageing: 60 women
A randomised, double-blind, placebo-controlled study in Brazilian women aged 45–60 (Rousselot, 2019) reported a 13% reduction in wrinkles around the eyes and a 10% reduction in nasolabial wrinkles compared with placebo.
Absorption
A randomised, double-blind crossover trial by Rousselot with BioTeSys and Triskelion (Virgilio et al., Frontiers in Nutrition, 2024) measured how collagen di- and tri-peptides and amino acids from Peptan® appear in the bloodstream after intake, supporting its bioavailability.
Rousselot is also researching Peptan® in other areas, including mobility, sports recovery and sleep. This research is emerging, and we will only describe it here once it is well established.
How we use Peptan®
- Collagen+ provides 1,200 mg of bovine Peptan® collagen peptides (Type I & III) per daily serving, in 60 or 120 capsule packs.
- Capsules, not powder: no mixing and no taste, in plant-based HPMC capsule shells with no gelatine.
- Made in the UK to GMP standards.
- A note on dose: the clinical studies above used 2.5–10 g of Peptan® a day, more than one Collagen+ serving provides. We publish the doses so you can compare for yourself.
Quality and certifications
Bovine Peptan® is halal certified by Halal Europe. See our certificates.
Food safety and quality certification across Rousselot plants.
Recognised as safe for use in food in the US.
Made from by-products that would otherwise go to waste (2025).
Our exclusive partnership with Rousselot
Our collagen ingredients are supplied by Darling Ingredients through its health brand Rousselot, and Nutrian has a formal exclusivity agreement with Rousselot. That means our hero collagen ingredient comes directly from the company that makes and researches it.
How we choose ingredients
- Understand the need: start with what the body uses and why.
- Review the evidence: look for published human studies on the specific ingredient, not just the category.
- Choose the source: named, traceable suppliers with halal and quality certification.
- Formulate honestly: state doses clearly and say where evidence is still emerging.
Frequently asked questions
Is Peptan® the same as ordinary collagen?
All are hydrolysed collagen, but Peptan® is a specific branded ingredient with its own manufacturing standards and its own published research.
Is the collagen halal?
Yes. We use bovine Peptan® certified by Halal Europe. See our halal certifications.
How long should I take collagen?
The studies above ran for 4 to 12 weeks. Collagen+ is a food supplement and should not replace a varied, balanced diet and healthy lifestyle.
Collagen with research behind it
Halal-certified bovine Peptan® collagen peptides in easy capsules, made in the UK.
Shop Collagen+Study summaries are based on research published by or with Rousselot. Results relate to the Peptan® ingredient at the stated doses and are not claims about Nutrian products. Peptan® is a registered trademark of Rousselot. Food supplements should not be used as a substitute for a varied, balanced diet and healthy lifestyle.