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The peptide disappeared from plasma within 4 hours
Many adults have low vitamin D levelsespecially if they spend most of their time indoors
The optimal concentration for over-the-counter products typically ranges from 0.1% to 2% GHK-Cu, with many studies suggesting 0.5% as an effective sweet spot for benefits without adverse reactions
Sikiric did not respond to repeated requests to share data from the trial
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