The claim that peptides send signals inside the body is accurate and reflects fundamental cellular biology. Peptides are endogenous signaling molecules — hormones, neuropeptides, and cytokines — that bind receptors and trigger intracellular cascades. This mechanism is not controversial or speculative; it is the foundation of endocrinology and molecular medicine. No contradiction or gap in evidence exists.
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Most people in fitness put steroids, peptides, and supplements in the same category.
But they work in completely different ways inside the body.
Steroids replace hormones.
Peptides send signals.
Supplements provide raw materials.
Understanding the difference is important if you want to actually understand how the body works.
If you have any doubts or questions, you can write it in the commen…
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Claim breakdown
1 claim“Peptides send signals [inside the body].”
Peptides function as signaling molecules is foundational biochemistry — well-established across decades of molecular biology and endocrinology literature. Peptides bind to cell surface and intracellular receptors, triggering cascades of intracellular signaling; this mechanism underlies hormones (insulin, glucagon, oxytocin), neuropeptides, and immune modulators. The claim requires no novel evidence because it describes a core principle of cell biology documented across thousands of peer-reviewed studies.
Supporting studies
- 1
S-modulin
Advances in experimental medicine and biology · 2002·PMID 12596915
- 2
Recoverin and rhodopsin kinase
Advances in experimental medicine and biology · 2002·PMID 12596917
- 3
Glucagon secretion from pancreatic α-cells
Upsala journal of medical sciences · 2016·PMID 27044683
- 4
Cytokine, sickness behavior, and depression
Neurologic clinics · 2006·PMID 16877117
- 5
Mechanisms of peptide hormone secretion
Trends in endocrinology and metabolism: TEM · 2006·PMID 17084640
- 6
The versatile synapse
The Journal of experimental biology · 1984·PMID 6150966
- 7
Signal transduction across alamethicin ion channels in the presence of noise
Biophysical journal · 1997·PMID 9370439
- 8
Worth Remembering: Eugenio Müller, MD, 1933-2015
Pediatric endocrinology reviews : PER · 2016·PMID 28508611
This audit is for educational purposes only. Not medical advice. Science evolves — always check citation dates and consult a qualified professional.
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