Ingredient or product comparison
GHK-Cu Solution Comparison
Light blue (turquoise) 0.5–1.0% 5.5–6.5 Refrigerated 2–8°C, <30 days old Fully active Optimal for daily cosmetic use. Low cytotoxicity risk, maintains collagen stimulation Deep blue-green (teal) 1.5–2.0% 6.0–7.0 Refrigerated 2–8°C, <60 days old Higher potency
This source-based comparison does not add ratings or recommend a winner.
- Light blue (turquoise)
- 0.5–1.0%
- 5.5–6.5
- Refrigerated 2–8°C, <30 days old
- Fully active
- Optimal for daily cosmetic use. Low cytotoxicity risk, maintains collagen stimulation
- Deep blue-green (teal)
- 1.5–2.0%
- 6.0–7.0
- Refrigerated 2–8°C, <60 days old
- Higher potency formulation. Effective for targeted remodeling, watch for irritation
- Pale green-blue (faded)
- <0.5% or degraded
- 5.0–6.0
- Stored >30 days or temp excursion
- Partially degraded
- Reduced efficacy. Copper dissociation likely, consider discarding
- Brown-green
- Oxidized copper
- Variable
- UV exposed or >25°C storage
- Inactive or pro-inflammatory
- Degraded. Apply this and you're delivering free copper ions, not functional complex
- Clear (colorless)
- 0% or unbound
- <5.0 or >7.5
- pH drift or never complexed
- Inactive
- Not GHK-Cu. Either pure peptide or total complex failure
- Cloudy blue
- Contaminated or precipitated
- Unknown, likely compromised
- Microbial growth or copper hydroxide precipitation. Discard immediately