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Illustratively, it is produced in the central nervous system (i.e., brainstems raphe nuclei) (12% of the serotonin in the human body), skin (i.e., Merkel cells), lung (pulmonary neuroendocrine cells), gastrointestinal tract (90% of the serotonin in the human body) (i.e., enterochromaffin cells), and rest of 8% is stored in platelets [166]

It is also referenced in broader discussions surrounding longevity peptides protocols, recovery-focused peptide stacks for sale, and growth hormone pathway optimisation studies

Front Cell Neurosci 9:16 Cunha-Oliveira T, Montezinho L, Mendes C et al (2020) Oxidative stress in amyotrophic lateral sclerosis: pathophysiology and opportunities for pharmacological intervention