Sel Sanayi A.Ş. - CollaSel

Sel Sanayi A.Ş., a subsidiary of Tezman Holding, is a manufacturer of hydrolyzed collagen peptides, collagen tripeptides, bioactive peptides, gelatin, and functional proteins. Established in 1961 as a producer of technical gelatin from bovine hides, the company has expanded over six decades into edible and pharmaceutical gelatin and a full range of collagen and protein solutions marketed under the CollaSel brand.

In 2022 Sel Sanayi became the first producer worldwide of bovine collagen tripeptide. In 2023 it became the first facility to produce both fish and bovine collagen tripeptides under one roof.

The CollaSel range is supported by three peer-reviewed clinical and scientific publications. In 2024, a double-blind randomized placebo-controlled clinical study on CollaSel Pro hydrolyzed collagen peptide for skin health was published in the Journal of Clinical Medicine. In 2025, a double-blind randomized placebo-controlled clinical trial on CollaSel PRO Type I and III hydrolyzed collagen peptides for the treatment of osteoarthritis was published in the Journal of Clinical Medicine. In 2026, a study on CollaSel Tripeptide evaluating ACE and DPP-IV inhibitory activity and GLP-1 stimulation was published in Biomedicines by researchers at the University of Milan.

The company serves customers in nutraceuticals, pharmaceuticals, cosmeceuticals, food, sports nutrition, and health and wellness. Sel Sanayi is EU accredited, operates a full traceability system, and exports to customers across Europe, the Middle East, Asia, and the Americas.