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When a peptide meets its receptor, its like a text message to the cell: Repair here, Make more collagen, or Turn down inflammation. Many therapeutic peptides are synthetic or lab-refined versions of molecules your body already produces, so they tend to work by amplifying or fine-tuning the bodys own signals rather than overriding them

Intravenous administration would overcome these problems, as it allows instant circulation of the precursors rather than initial metabolism by the gut microbiota and liver

But does the science actually support them

Melatonin receptor activation increases glutamatergic synaptic transmission in the rat medial lateral habenula

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