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[Glossary](/glossary)/ Collagen 

Basics 

# Collagen

## Definition

The most abundant protein in the body, providing structure to skin, bones, tendons, and connective tissue.

## Why It Matters

Peptides like GHK-Cu are studied for their ability to stimulate collagen production for skin and tissue repair.

## Related Terms

[Extracellular Matrix](/glossary/extracellular-matrix)[Fibroblast](/glossary/fibroblast)

## Related Peptides

[Abaloparatide 

Abaloparatide (Tymlos) is a synthetic 34-amino-acid analog of parathyroid hormone-related protein, PTHrP(1-34), engineered to bind the PTH1 receptor with a strong preference for its transient RG conformation rather than the long-lived R0 conformation favored by teriparatide. That receptor bias produces a shorter burst of signaling per injection - enough to drive osteoblast activity, but short enough to limit the bone resorption and calcium mobilization that follow a prolonged signal. In the 18-month Phase 3 ACTIVE trial in 2,463 postmenopausal women, abaloparatide 80 mcg daily reduced new morphometric vertebral fractures by 86% versus placebo, alongside significant reductions in nonvertebral, major osteoporotic and clinical fractures. The FDA approved Tymlos in April 2017; in December 2021 the osteosarcoma boxed warning and the two-year cumulative lifetime limit were both removed from the label.

](/peptides/abaloparatide)[BPC-157 

A pentadecapeptide derived from human gastric juice, studied for tissue repair and gut-protective properties.

](/peptides/bpc-157)[BPC/TB500 Blend 

A combined formulation of BPC-157 and TB-500, the two most commonly paired tissue repair peptides.

](/peptides/bpc-tb500-blend)[CJC-1295 

A growth hormone releasing hormone analog studied for stimulating growth hormone secretion.

](/peptides/cjc-1295)

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