The Peptide Database

This is the master index for the NuGenia peptide reference library. It consolidates the core molecular data — molecular weight, amino acid count, sequence where short enough to list, plasma half-life, and primary research focus — for the 45+ peptides and research compounds most commonly encountered in laboratory work.

Each compound is grouped into one of eight functional classes. As individual compound pages are published, the peptide name in the master table links through to its full reference page covering reconstitution, stability, mechanism, and research history.

How to Use This Database

The master table below is the quick-reference view. Columns are:

• Molecular weight (MW) — given in g/mol (daltons), free-base form. Used for concentration math during reconstitution.
• Amino acids — chain length. A rough proxy for structural complexity and solution stability. Non-peptide compounds are marked.
• Half-life — approximate plasma half-life. The primary determinant of dosing frequency in research protocols.
• Research focus — the primary area in which the compound is studied.

For reconstitution ratios and syringe math, see the Complete Peptide Reconstitution Reference. For storage and stability data, see the Peptide Storage & Stability Reference.

Master Reference Table

All 45+ compounds, grouped by class. Molecular weights are free-base values from published literature and PubChem; batch-specific values vary — see Notes on the Data.

* GHK-Cu: first value is the free tripeptide, second is the copper complex. Semax/Selank: plasma half-life is minutes, but central effects outlast plasma presence. Values prefixed "~" are approximate — confirm against the certificate of analysis for the specific batch.

Healing & Tissue Repair

This class covers peptides studied for wound healing, tissue regeneration, anti-inflammatory activity, and cytoprotection. The defining members — BPC-157 and the Thymosin Beta-4 family — are among the most widely researched peptides in the entire field.

A key sourcing note lives in this class: "TB-500" is an ambiguous label. Technically TB-500 is a synthetic 7-amino-acid fragment (Ac-LKKTETQ) corresponding to the actin-binding motif of Thymosin Beta-4. In practice, the overwhelming majority of research material sold as "TB-500" is full-length Thymosin Beta-4 — a 43-amino-acid peptide, MW ~4,921 g/mol. Always confirm which molecule a certificate of analysis describes.

The class spans a wide size range: GHK-Cu and KPV are 3-amino-acid peptides that are extremely stable in solution, while LL-37 (37 aa) and Thymosin Beta-4 (43 aa) are large and more sensitive to handling.

Growth Hormone Secretagogues

Growth hormone secretagogues stimulate endogenous growth hormone release rather than supplying growth hormone directly. The class splits into two mechanistic families: GHRH analogs (Sermorelin, CJC-1295, Tesamorelin — based on growth hormone-releasing hormone) and ghrelin mimetics / GHRPs (Ipamorelin, GHRP-2, GHRP-6, Hexarelin — acting on the ghrelin receptor).

Half-life is the critical differentiator. CJC-1295 with DAC (Drug Affinity Complex) binds albumin and persists for 6–8 days, while CJC-1295 without DAC (Mod GRF 1-29) clears in about 30 minutes despite a nearly identical molecular weight. That single structural difference — a 30th amino acid position enabling the DAC modification — is the entire reason the two are dosed completely differently.

MK-677 (Ibutamoren) sits in this class functionally but is not a peptide — it is an orally bioavailable small-molecule ghrelin mimetic with a ~24-hour half-life.

Metabolic & GLP-1

This class is dominated by the incretin receptor agonists — the most structurally sophisticated peptides in the database. Semaglutide (GLP-1 agonist), Tirzepatide (dual GIP/GLP-1 agonist), and Retatrutide (triple GIP/GLP-1/glucagon agonist) all share a common engineering strategy: a fatty-acid diacid chain attached via a linker that drives albumin binding and extends half-life to 5–7 days, enabling once-weekly research protocols.

The older members of the class — AOD-9604 and HGH Fragment 176-191 — are both 16-amino-acid fragments derived from the C-terminal region of human growth hormone, studied primarily for lipolytic activity. They are far smaller and shorter-acting than the incretin agonists.

Nootropic & Cognitive

The nootropic peptides are studied for effects on cognition, mood, neuroprotection, and sleep. Semax and Selank — both 7-amino-acid peptides developed from endogenous regulatory peptides — are the best-known members and are frequently studied via intranasal administration. Their plasma half-life is measured in minutes, but reported central effects outlast plasma presence, which is a recurring theme in this class.

DSIP (Delta Sleep-Inducing Peptide) is a 9-amino-acid peptide studied in the context of sleep architecture. Cerebrolysin is unusual — it is not a single molecule but a standardized mixture of low-molecular-weight neuropeptides and amino acids.

Longevity & Mitochondrial

This class includes peptides studied in the context of cellular aging, telomere biology, and mitochondrial function. It contains two notable mitochondrial-derived peptides — MOTS-c (16 aa) and Humanin (24 aa) — which are encoded within the mitochondrial genome itself, a relatively recent and active area of research.

Epitalon is a 4-amino-acid peptide (the smallest in the database) studied for effects on the pineal gland and telomerase activity. SS-31 (Elamipretide) is a mitochondrially-targeted tetrapeptide studied for its interaction with cardiolipin on the inner mitochondrial membrane.

Immune, Thymic & Sexual Function

Two related groups sit here. The immune/thymic peptides — Thymosin Alpha-1 (28 aa) and Thymalin (a thymic peptide mixture) — are studied for immune modulation and were among the earliest biologically active peptides isolated from thymic tissue.

The sexual function peptides include the melanocortin agonists PT-141 (Bremelanotide) and Melanotan II — closely related cyclic 7-amino-acid peptides — and the reproductive-axis peptides Kisspeptin-10 and Gonadorelin, both 10-amino-acid peptides with very short half-lives studied in the context of the hypothalamic-pituitary-gonadal axis.

Growth Factors & Other Research Compounds

The IGF family contains the largest peptides in the database. IGF-1 LR3 (83 aa, ~9,111 g/mol) is an engineered long-acting variant of insulin-like growth factor 1; IGF-1 DES and IGF-2 are related growth factor variants. These are complex, structured proteins rather than simple linear peptides.

The database also includes several widely studied non-peptide research compounds for completeness, since they are routinely researched alongside peptides: 5-Amino-1MQ (an NNMT inhibitor), NAD+ (a redox coenzyme), Methylene Blue (a redox-active compound), and Glutathione (technically a tripeptide, studied as an antioxidant). Their non-peptide status is flagged in the master table.

Notes on the Data

Molecular weight conventions

Molecular weights listed are free-base values from published literature and PubChem. The actual mass of a supplied peptide vial depends on the salt form (trifluoroacetate and acetate counterions are common) and the degree of hydration. As one manufacturer puts it plainly, batch-specific molecular weights vary from batch to batch due to the degree of hydration, which affects the solvent volume needed to prepare a given concentration. For precise concentration math, always use the batch-specific molecular weight from the certificate of analysis.

Half-life values

Half-life figures are approximate and aggregated from published pharmacokinetic literature. They vary with species, route of administration, and assay method. Where a peptide has a short plasma half-life but longer-lasting downstream effects (common in the nootropic class), this is noted.

Values marked with "~"

A tilde indicates an approximate or less firmly established value — typically for newer compounds or those with batch-dependent or formulation-dependent characteristics. Treat these as starting points and verify against current vendor documentation.