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Yes, certain small peptides can cross the blood-brain barrier, the protective filter that controls what enters brain tissue, which lets them act directly on the nervous system
Each has a different decision-maker and a different legal effect
GHK-Cu is 340.4 Da, which sounds permissive, but the practical absorption rate of charged tripeptides through the stratum corneum is essentially zero without enhancement 4
Jan 31, 2026 Deep inside every neuron in your brain, a molecular cascade determines whether that cell will grow stronger, form new connections, or slowly wither
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