Research articles, peptide comparisons, clinical trial analysis, and the latest peptide science.
In-depth articles covering clinical research, peptide comparisons, sourcing guides, and the latest findings from peer-reviewed studies. Written for researchers and anyone tracking the evidence.
A certificate of analysis tells you something about a single batch of material. It tells you almost nothing about the company that sold it. Two vials with identical-looking COAs can…
If you spend any time reading about research peptides, you will quickly notice a pattern. A compound is described as “shown to” accelerate healing, raise growth hormone, protect the gut,…
peptides.fyi is produced by a small team of science writers and research contributors. We want to be clear and honest about what that means: we are writers and research compilers,…
peptides.fyi is an independent educational reference covering peptides, SARMs, SERMs, and related research compounds. Because this is health-adjacent information that people may use to inform real decisions, we hold our…
How RAD-140 and LGD-4033 compare on mechanism, trial findings, suppression and liver signals, and the regulatory and quality issues that surround SARMs.
What enclomiphene is, how it raises testosterone through the HPG axis, why it differs from TRT on fertility, and its clinical evidence and regulatory status.
What NAD+ is, why its age-related decline matters, how it differs from precursors like NMN and NR, and what human trials have and have not demonstrated.
What MOTS-c is, why a mitochondrial-derived peptide is unusual, how it acts as an exercise mimetic, and what the longevity research does and does not show.
What glutathione is, its role as the cell's main antioxidant, why delivery format is a recurring research question, and what the evidence does and does not support.
What the KLOW peptide blend is, the four research peptides it combines, the rationale behind the stack, and an honest look at its preclinical evidence stage.
Does GLP-1 weight loss cause muscle loss? What lean mass measurements actually mean, what newer research suggests, and the strategies studied to preserve it.
What tirzepatide microdosing means, why interest in sub-therapeutic dosing has grown, what the evidence does and does not show, and the open safety questions.
How retatrutide titration works in research, the trial dose-escalation schedule, the side effects that shape it, and where the controlled-dose pen fits.
What a controlled-dose pen is, how it differs from a reconstituted vial, and why the format affects research dosing accuracy and handling.
The peptide bond is the fundamental connection that holds amino acids together. We explain the chemistry in plain terms, from basic bond formation all the way to how structure determines…
A detailed research review of the two most commonly paired growth hormone peptides. We cover individual mechanisms, the rationale for combining them, and what clinical data exists.
Peptides break down fast if handled wrong. We cover the science of stability, proper storage temperatures, reconstitution best practices, and the chemical reactions that degrade peptides over time.
A deeper dive into the two most popular recovery peptides in the research literature. We compare mechanisms, study quality, tissue specificity, and what the combination research suggests.
Not all peptide lab reports are created equal. We explain what HPLC and mass spec tests actually measure, how to read a certificate of analysis, and what separates trustworthy testing…
Two brain-boosting peptides developed by Russian scientists. We look at the published research on Selank for anxiety and Semax for cognition, and what Western science makes of these compounds.
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