Good GHK-cu powder source?

The 3% range is strong for topical. Most start at 1.5% first to gauge skin response. Powder quality varies by source - blue color confirms intact copper chelation but isn't a complete quality indicator.
 
KPV and GHK-Cu together for eczema is one of the more common skin-focused stacks - KPV works on the anti-inflammatory signaling and GHK on collagen and tissue repair, so they address different parts of the eczema mechanism. Two weeks is early to see the full result; most people report the clearest signal around weeks 4-6.
 
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