GHK-Cu is a tiny three-amino-acid peptide — glycine, histidine, and lysine — bound to a copper ion. Your body produces it naturally, but levels drop significantly with age, which researchers believe contributes to slower skin repair and visible aging. When applied to skin, it acts almost like a repair signal, telling cells to rebuild and restore.

GHK-Cu works by activating genes involved in collagen and elastin production, which are the proteins that keep skin firm and bouncy. It also dials down inflammation, speeds up the removal of damaged tissue, and signals the body to grow new blood vessels in healing areas. In the scalp, it appears to wake up dormant hair follicles and extend the active growth phase of hair.

Serums are the most popular and effective delivery format because they penetrate easily. Creams are gentler and good for sensitive or dry skin. Scalp serums are specifically formulated to reach hair follicles. Microneedling solutions are designed to be applied during or after microneedling sessions, when the skin barrier is temporarily open and absorption is highest. Look for pH-balanced formulas (around 6–7) with GHK-Cu listed near the top of the ingredient list.

• Wrinkles and fine lines
• Sagging or thinning skin
• Slow wound healing
• Acne scars and scarring
• Hair loss and hair thinning
• Uneven skin tone and texture
• Sun-damaged skin
• Skin dryness and rough texture
• Stretch marks
• Scalp health

• Age-related skin thinning with long-term use
• Excessive scar formation after wounds or procedures
• UV-induced collagen degradation (as part of a broader skincare routine)

• Copper-rich foods (organ meats, oysters) — The GHK-Cu peptide requires copper to function. While eating copper-rich foods won't deliver the peptide itself, adequate copper intake supports the body's natural GHK-Cu production and the enzymes involved in collagen cross-linking.
• Bone broth — Rich in small peptides, glycine, and proline — the amino acid building blocks that the body uses to make collagen and, in part, naturally occurring GHK sequences.
• Egg whites — High in glycine and other amino acids that contribute to collagen synthesis and the body's peptide production.
• Fatty fish (salmon, mackerel) — Omega-3 fats reduce inflammation and support healthy skin cell membranes, creating a better environment for GHK-Cu to exert its repair effects.
• Dark leafy greens (spinach, kale) — Provide vitamin C, which is essential for collagen synthesis — the same process that GHK-Cu stimulates topically. Without adequate vitamin C, collagen production is impaired regardless of peptide signaling.

• Mild redness or warmth in the first 1–2 weeks as skin adjusts
• Temporary breakout or purging, especially if starting with a high-concentration serum
• Slight blue or green tint to skin immediately after application (from the copper) — this washes off
• Rare allergic contact dermatitis in copper-sensitive individuals
• Slight stinging on broken or actively irritated skin
• Temporary dryness if over-applied or layered with too many other actives

• Recommended daily: Apply a thin layer (2–4 drops of serum, or a pea-sized amount of cream) to clean, dry skin once daily. For advanced users or post-procedure recovery, twice daily is appropriate. Concentration of GHK-Cu in products typically ranges from 0.1% to 3% — start lower if your skin is new to it.
• Best time of day: Evening is ideal for most users, as skin repair cycles are most active overnight. However, GHK-Cu does not cause sun sensitivity, so morning use is safe and fine if preferred.
• With or without food: Topical — not applicable. Apply to clean, damp skin before heavier moisturizers or oils in your routine.
• Time to effect: Texture improvements in 4–8 weeks; collagen-level changes and visible anti-aging results in 3–6 months with consistent daily use
• How long to take it: GHK-Cu is safe for long-term, indefinite daily use with no known tolerance buildup or need for cycling. Consistency is the key — sporadic use will not deliver meaningful results.