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This speculation derived from the discovery by Stephen Bloom in London that injection of GLP-1 into the intracerebral ventricles strongly inhibited feeding in fasted rats
On-site lab collection can make this part of the process simpler when testing is needed
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Molecular size affects absorption, with smaller peptides generally crossing the mucosal barrier more easily than larger ones
**Additional tests and blood work may be needed How to self-inject peptides
Last reviewed: November 16, 2025 All COVID-19 vaccines are administered intramuscularly
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