Research library

Guides and research notes.

Written for practice managers, clinicians buying for research programs, and lab staff. Chemistry, analytics, paperwork and the published literature. Nothing here is a usage guide.

All Compound research Certificates & testing Handling & storage Comparisons Buying & regulatory Peptides 101

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Comparisons · Immunology

Thymalin vs Thymosin Alpha-1: Extract Fraction vs Defined Sequence

Thymalin vs thymosin alpha-1: why one is a 28-residue defined peptide and the other a calf-thymus extract, how their certificates differ, regulatory status, and literature quality.

October 21, 2026 · 9 min read

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Comparisons · Semax

Semax vs Selank: Two Russian Heptapeptides Compared

Semax and Selank compared by sequence origin (ACTH vs tuftsin), mass, charge, proposed target class, the rodent and cell literature, and what a blend certificate must show.

October 21, 2026 · 9 min read

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Comparisons · Bioregulators

Pinealon vs Epithalon: Two Khavinson Peptides Compared

Pinealon (Glu-Asp-Arg) vs Epithalon (Ala-Glu-Asp-Gly): sequence, mass, charge, the shared DNA-binding hypothesis, which findings belong to which peptide, and what a COA can verify.

October 21, 2026 · 9 min read

Three sealed lyophilized peptide vials in a row on a slate laboratory bench under navy and red lighting

Comparisons · Melanocortin

Melanotan I vs Melanotan II vs PT-141: Three Melanocortin Analogs Compared

Melanotan I, Melanotan II and PT-141 compared: linear vs lactam-cyclized structure, receptor selectivity, which became Scenesse and Vyleesi, and what a certificate must show.

October 21, 2026 · 9 min read

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Comparisons · Growth Hormone Secretagogue

Ipamorelin vs Sermorelin vs TH9507: The Growth Hormone Secretagogue Family

Ipamorelin, sermorelin and TH9507 compared by receptor class, sequence length, N-terminal modification, approval history (Geref, Egrifta) and literature maturity.

October 21, 2026 · 9 min read

Three sealed lyophilized peptide vials, one smaller, in a row on a slate laboratory bench under navy and red lighting

Comparisons · Mitochondrial

Humanin vs MOTS-c vs SS-31: Three Mitochondria-Focused Peptides Compared

Humanin, MOTS-c and SS-31 compared: two peptides encoded by mitochondrial rRNA genes vs one synthetic cardiolipin binder, target classes, Forzinity approval, and certificate liabilities.

October 21, 2026 · 10 min read

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Comparisons · GHRP

GHRP-2 vs GHRP-6: Sequence, Receptor Affinity, and Research History

GHRP-2 vs GHRP-6: two Bowers hexapeptides two residues apart, the same GHS-R1a receptor, GHRP-6's extra CD36 affinity, Japanese approval of pralmorelin, and blend certificates.

October 21, 2026 · 9 min read

Two sealed lyophilized peptide vials of different heights on a steel laboratory bench under navy and red lighting

Comparisons · CJC-1295

CJC-1295 vs Ipamorelin: GHRH Analog vs Ghrelin Mimetic

CJC-1295 and ipamorelin compared: GHRH receptor vs ghrelin receptor, 3.4 kDa vs 712 Da, the DAC albumin tail, why the pair is studied together, and what a blend certificate must show.

October 21, 2026 · 10 min read

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Comparisons · BPC-157

BPC-157 vs TB-500: Structure, Origin, and Research Focus Compared

A chemistry-first comparison of BPC-157 and TB-500 (thymosin beta-4): sequence, mass, proposed target, literature quality, and what a blend certificate must list.

October 20, 2026 · 11 min read