Muscle Intelligence What 20 Years of Peptide Use Taught Me (Most Experts Won't Say This)
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Mar 23, 2026 A deep dive into peptide safety, purity testing, and why sourcing matters more than labels. Discussion of FDA moves and classification concerns affecting common peptides. Breakdown of nine peptide categories from growth hormone secretagogues to tissue repair, mitochondrial longevity, cognitive and metabolic peptides. Practical emphasis on stabilizing sleep, gut and diagnostics before experimenting with peptides.
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Early Bad Reaction Made Him Cautious
- Ben Pekulski used peptides from China in the early 2000s and experienced injection-site reactions and occasional fevers.
- That early bad reaction made him cautious and later drove him to seek pharmaceutical or vetted compounding sources.
Which Peptide Contaminants Matter Most
- Key contaminants to worry about are heavy metals (mercury, lead, arsenic), endotoxin/LPS, and TFA from solid phase peptide synthesis.
- These contaminants can provoke injection-site reactions, fevers, liver stress, or even life-threatening responses depending on immune status.
Test Your Body Before Using Peptides
- Treat peptides as signals that interact with your unique genetics, hormones, inflammation, and immune status before using them.
- Ben Pekulski advises testing genetics, blood, urine, stool, sleep, and stress to identify the system constraint before selecting peptides.