Steadfast Research Group Research Blog
Plain-language explainers on peptide research, quality verification, and laboratory practices — sourced, dated, and reviewed.
Tirzepatide's Dual GIP/GLP-1 Receptor Mechanism
Published pharmacology describes tirzepatide as an imbalanced dual agonist favouring the GIP receptor, and as cAMP-biased at the GLP-1 receptor.
What Does Research Say About Tirzepatide?
Tirzepatide (LY3298176) is a 39-amino-acid dual GIP and GLP-1 receptor agonist whose discovery paper reported a mean half-life near five days.
What Does Research Say About Retatrutide?
Retatrutide (LY3437943) is an investigational triple GIP, GLP-1 and glucagon receptor agonist studied from a 2022 discovery paper through phase 3.
What Has Research Shown About BPC-157 and Angiogenesis?
BPC-157 angiogenesis research is preclinical: chick membrane, tube-formation and rat hind-limb ischaemia models reported increased vessel density.
What Has Research Reported on BPC-157 in the Gut?
BPC-157 gut research is preclinical: rat studies reported fewer gastric, duodenal and colonic lesions, closed fistulas and short-bowel weight gain.
What Does Research Show on BPC-157 and Tendons?
Rat Achilles and ligament transection studies reported faster recovery with BPC-157, but the tendon evidence remains preclinical, not human.
What Mechanisms Has Research Proposed for BPC-157?
Preclinical studies have proposed several overlapping pathways for BPC-157: VEGFR2, nitric oxide, FAK-paxillin, growth hormone receptor and EGR-1.
How Researchers Verify Peptide Quality Before Use
Researchers verify a peptide by matching the COA to the vial lot, confirming identity by mass spectrometry, reading HPLC purity, and checking net content.
What Does Research Say About Semaglutide?
Published research describes semaglutide as a GLP-1 analogue with Aib8 and Arg34 substitutions and a C18 diacid chain acylated at lysine 26.
Domestic vs Overseas Research Peptide Sourcing
Domestic and overseas peptide sourcing differ on four axes: batch documentation, transit conditions, import exposure, and recourse when a batch fails.
What Is Lyophilization and Why Are Peptides Freeze-Dried?
Lyophilization is vacuum sublimation of ice from frozen peptide solution, removing the water that drives hydrolysis, deamidation and aggregation.
Why Independent Third-Party Peptide Testing Matters
Independent testing matters because purity is a per-batch measurement: outside labs measured 7.7-14.37% purity in online peptide vials labelled 99% pure.
What Does Research Say About GHK-Cu?
GHK-Cu research spans 50+ years: fibroblast, rodent, and gene-expression studies observed effects on collagen, matrix remodeling, and oxidative markers.
Red Flags to Watch For When Sourcing Research Peptides
The biggest red flags in peptide sourcing: no batch-specific COA, purity claimed without a named method or lab, static lot numbers, and outcome marketing.
How Mass Spectrometry Verifies a Peptide's Identity
How mass spectrometry confirms a research peptide's identity: measured mass versus theoretical mass, ESI and MALDI, tandem sequencing, and why mass is not purity.
How Peptide Concentration Is Calculated When Reconstituting
Concentration equals net peptide mass divided by solvent volume (mg/mL). Counterions and residual water mean net mass is below the vial's label weight.
How to Spot a Fake or Altered Peptide COA
How researchers detect a fake or altered peptide Certificate of Analysis: lot matching, named testing lab, real HPLC and mass-spec data, dates, and chromatograms.
How Are Research Peptides Reconstituted in the Lab?
Laboratory procedure for reconstituting lyophilized research peptides: solvent choice (bacteriostatic vs sterile water), concentration math in mg/mL, and stability.
How Should Research Peptides Be Stored?
Lyophilized research peptides are kept cold, dry, and dark: refrigerated short term, frozen at -20°C or -80°C long term; reconstituted vials held at 2–8°C.
How to Evaluate a Research Peptide Supplier
How researchers evaluate a research peptide supplier: independent third-party testing, lot-specific COAs, purity documentation, transparency, handling, and honest research-use-only framing.
How to Read a Peptide Certificate of Analysis
A plain-language guide to reading a peptide Certificate of Analysis: identity, purity, HPLC, mass spectrometry, lot matching, and red flags.
What Are Research Peptides and How Are They Studied?
A plain-language explainer on research peptides: what a peptide is, what research-use-only means, how peptides are studied in vitro and in preclinical models, and why purity and COAs matter.
What Does Research Say About BPC-157?
A research-framed profile of BPC-157: what preclinical rodent and in-vitro studies observed in tendon, ligament, gut, and angiogenesis models, and why the evidence is preclinical.
What Research Says About TB-500 (Thymosin Beta-4)
Published TB-500 research is largely preclinical: thymosin beta-4 studies examined actin binding, cell migration, and tissue repair in animal models.
What Does 'Research Use Only' Mean for Peptides?
What 'for research use only' means for peptides: an intended-use designation for laboratory materials, distinct from approved drugs and dietary supplements.
What Is Bacteriostatic Water for Peptide Reconstitution?
Bacteriostatic water is sterile water with about 0.9% benzyl alcohol, a preservative that lets a vial serve multiple research reconstitutions.
What Is HPLC and How Does It Test Peptide Purity?
What HPLC is and how reversed-phase HPLC measures peptide purity: columns, gradients, UV detection at 214 nm, chromatogram peak-area percent, and the COA.
What Is Peptide Purity and Why Does It Matter?
Peptide purity is the percent of a sample that is the target peptide, measured by HPLC. It matters because impurities can distort research results.