Ingredient or product comparison
GHK-Cu Protocol Dosage Timing: Formulation Comparison
Water-based serum 1–3% GHK-Cu Morning + evening on damp skin Epidermis + upper dermis 90 days refrigerated Best bioavailability but requires immediate refrigeration after opening. Peptide degrades in aqueous solution at room temperature Anhydrous oil suspensio
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- Water-based serum
- 1–3% GHK-Cu
- Morning + evening on damp skin
- Epidermis + upper dermis
- 90 days refrigerated
- Best bioavailability but requires immediate refrigeration after opening. Peptide degrades in aqueous solution at room temperature
- Anhydrous oil suspension
- 0.5–2% GHK-Cu
- Evening only (occlusive)
- Epidermis primarily
- 12 months at room temp
- Longest shelf stability but slower penetration. Copper release delayed by lipid carrier matrix
- Liposomal encapsulation
- Morning preferred
- Deep dermis
- 6 months refrigerated
- Highest dermal penetration due to phospholipid carrier. Expensive but most effective for photoaging reversal
- Cream emulsion
- 1–2% GHK-Cu
- Morning or evening
- Upper dermis
- 6 months at room temp
- Mid-range option. Easier to formulate at home but emulsifiers may compete for copper binding