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Injection routes provide direct entry into systemic circulation through subcutaneous delivery or intramuscular delivery, producing higher peptide availability for tissue interaction in research environments

PMID: 8634414

Development of a hyperbranched polymer-based methotrexate nanomedicine for rheumatoid arthritis

The findings indicate that microbial metabolite 4-ethylphenyl sulfate (4EPS) enters the brain and is associated with changes in region-specific activity and functional connectivity, including altered oligodendrocyte function, impaired oligodendrocyte maturation, and decreased oligodendrocyte-neuron interactions (Needham et al., 2022)

While the efficacy data did not survive the Phase IIb primary endpoint, the safety dataset across 900 participants is unusual for a research peptide and is consistently cited as the basis for continued investigational interest