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Peptide Tag: Weight loss

GLP-2 (Teduglutide)

Glucagon-like peptide-2 is a naturally occurring intestinal peptide that promotes gut mucosal growth and repair. It enhances nutrient absorption, strengthens the intestinal barrier, and is FDA-approved for short bowel syndrome. Promising for gut health and recovery.

PT-141 (Bremelanotide)

An FDA-approved melanocortin receptor agonist, PT-141 works through the central nervous system to enhance sexual arousal. Unlike PDE5 inhibitors, it acts on brain pathways rather than vascular mechanisms.

GLP-3 (Oxyntomodulin)

GLP-3, also known as Oxyntomodulin, is a dual agonist that activates both GLP-1 and glucagon receptors. It provides powerful metabolic benefits including fat loss, appetite suppression, and increased energy expenditure, making it a next-generation metabolic peptide.

MK-677 (Ibutamoren)

While technically a growth hormone secretagogue rather than a peptide, MK-677 orally stimulates GH release through the ghrelin receptor. Popular for its convenience and effectiveness in promoting muscle growth.

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Skin · Longevity
Copper Tripeptide

GHK-Cu: The Copper Peptide
and Dermal Regeneration

  • March 28, 2026
  • 4 min read

GHK -Cu (Glycyl-L-Histidyl-L-Lysine-Copper) is a human-derived tripeptide with an extraordinary ability to bind to copper. Discovered in the 1960s by biochemist Loren Pickart, this peptide has proven to be a potent activator of skin regeneration, with solid evidence in preclinical in vitro and in vivo studies.

As we age, plasma levels of GHK-Cu decrease dramatically — from ~200 ng/mL at age 20 to <80 ng/mL after age 60. This drop is directly correlated with loss of firmness, slower healing, and increased oxidative damage to the skin.

300%

More collagen vs. placebo

12h

estimated half-life

1960s

discovered by Loren Pickart

High

level of preclinical evidence

Benefits documented in research

Collagen synthesis

It stimulates the production of collagen types I and III, improving skin firmness and elasticity.

Powerful anti-inflammatory

It reduces inflammatory markers such as IL-6 and TNF-α, protecting dermal tissue.

Accelerated healing

It promotes the proliferation of fibroblasts and keratinocytes to repair wounds faster.

Hydration and skin barrier

It strengthens the lipid barrier and improves moisture retention in the dermis.

Cellular Antioxidant

Copper acts as a cofactor of superoxide dismutase, neutralizing free radicals.

Tissue regeneration

It activates genes for repairing and remodeling the extracellular matrix.

Mechanism of action

GHK-Cu acts as an epigenetic modulator: it activates more than 31 genes related to tissue repair and silences pro-inflammatory genes. Copper is an essential cofactor of lysyl oxidase (a key enzyme in collagen and elastin synthesis) and SOD1 (superoxide dismutase), giving this complex simultaneous antioxidant and regenerative properties.

Dosage

1–2 mg/week

Route of administration

Subcutaneous / Topical

Recommended cycle

6–8 weeks
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⚠️ This article is for educational and research purposes only. It does not constitute medical advice. Always consult a healthcare professional before starting any protocol.