Ingredient or product comparison
GHK-Cu Serum DIY: Comparison of Preparation Methods
Water-only mixing (most common DIY) Not specified. Often <90% None. Relies on pre-chelated peptide None. PH drifts to 5.5–6.0 7–10 days before visible precipitation Fast, simple, but unstable and low efficacy. Copper often precipitates within a week Phosphate-
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- Water-only mixing (most common DIY)
- Not specified. Often <90%
- None. Relies on pre-chelated peptide
- None. PH drifts to 5.5–6.0
- 7–10 days before visible precipitation
- Fast, simple, but unstable and low efficacy. Copper often precipitates within a week
- Phosphate-buffered saline (PBS) method
- ≥95% recommended
- Controlled. Separate copper addition with molar ratio calculation
- Yes. PBS maintains pH 7.2–7.4
- 6–8 weeks with antioxidant
- Gold standard for research prep. Requires precise measurements but produces stable, bioactive serum
- Propylene glycol solvent system
- ≥98% required
- Pre-chelated peptide only
- Not required. Glycol stabilises pH
- 10–12 weeks
- Commercial formulation approach. Extends shelf life but requires pharmaceutical-grade excipients
- Hyaluronic acid carrier gel
- Passive. HA buffers to ~pH 6.5
- 4–6 weeks refrigerated
- Best for thicker serum texture. HA supports peptide penetration but reduces copper stability slightly
- The PBS method balances stability, control, and preparation complexity for home use. Water-only mixing is acceptable for immediate-use batches consumed within 10 days.