Ingredient or product comparison
GHK-Cu Timing: Comparison of Dosing Windows
9–10 PM (optimal) Maximal (100% baseline) Direct overlap with 11 PM–2 AM GH pulse 100% reference standard Requires consistent sleep schedule 6–8 AM (suboptimal) Minimal (30–40% baseline) No overlap—GH nadir period 40–50% of evening dosing Convenient but wastes
This source-based comparison does not add ratings or recommend a winner.
- 9–10 PM (optimal)
- Maximal (100% baseline)
- Direct overlap with 11 PM–2 AM GH pulse
- 100% reference standard
- Requires consistent sleep schedule
- 6–8 AM (suboptimal)
- Minimal (30–40% baseline)
- No overlap—GH nadir period
- 40–50% of evening dosing
- Convenient but wastes half the compound
- 12–2 PM (mid-day)
- Low (50–60% baseline)
- Partial overlap with minor afternoon GH pulse
- 55–65% of evening dosing
- Misses primary nocturnal repair window
- 10–11 PM (late optimal)
- High (90–95% baseline)
- Overlaps tail end of GH pulse
- 85–90% of 9 PM dosing
- Acceptable if earlier dosing conflicts with schedule