Kangxi arranged for his whole family to be variolated, an early form of immunization in which healthy individuals were deliberately inoculated
Most claims exceed current clinical evidence
Topical vs Injectable Tolerability Topical GHK-Cu appears better tolerated than injectable forms, with topical side effects typically limited to mild redness, itching, or irritation at application site and rare copper uglies phenomenon (anecdotal accelerated skin aging appearance due to potential MMP upregulation, not well-studied)
StatPearls [Internet], 2023 June Takaaki Sugihara, Masahiko Koda, Toshiaki Okamoto, Kenichi Miyoshi, Tomomitsu Matono, Kenji Oyama, Keiko Hosho, Jun-ichi Okano, Hajime Isomoto, Yoshikazu Murawaki
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