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A chronological feed of additions to PeptideSciences101: new peptide articles, FDA approvals, research entries, and source additions. Newest first. Sourced facts only — no dosage guidance.
1241 updates

October 2026

GHRP-4 is a synthetic tetrapeptide with the primary sequence D-Trp–L-Ala–L-Trp–D-Phe–NH2 (molecular weight 607.7 Da; molecular formula C34H37N7O4). It belongs to the growth hormone-releasing peptide (GHRP) family, a series of met-enkephalin analogs incorporating unnatural D-amino

Deep dive · 19 October 2026 · GHRP-4

Sermorelin is a synthetic 29-amino acid peptide constituting the biologically active N-terminal fragment of human growth hormone-releasing hormone (GHRH). Despite representing only positions 1 through 29 of the 44-residue parent molecule, this fragment retains essentially full ag

Deep dive · 19 October 2026 · Sermorelin

Fourth generation GHRP

Peptide · 19 October 2026 · GHRP-4

GHRH for natural GH release

Peptide · 19 October 2026 · Sermorelin

Tanning, libido

Peptide · 19 October 2026 · Melanotan II

Sleep quality amino peptide

Peptide · 19 October 2026 · Glycine Peptide

Synthetic decapeptide identical to hypothalamic GnRH; binds pituitary receptors to trigger LH and FSH release. No approved US product remains.

Peptide · 19 October 2026 · Gonadorelin

GHRH for natural GH release

Peptide · 19 October 2026 · Sermorelin

Cell renewal peptide

Peptide · 19 October 2026 · Hexapeptide-11

Collagen booster

Peptide · 19 October 2026 · Palmitoyl Tripeptide-5

Collagen synthesis peptide

Peptide · 19 October 2026 · Syn-Coll

Russian immune peptide

Peptide · 19 October 2026 · Imunofan

Digestive system bioregulator

Peptide · 19 October 2026 · Ovagen

Thyroid function support

Peptide · 19 October 2026 · Thyreogen

Thymus bioregulator complex

Peptide · 19 October 2026 · Vladonix

Melanotan II (MT-II) is a synthetic cyclic heptapeptide analogue of alpha-melanocyte-stimulating hormone (alpha-MSH), developed at the University of Arizona in the late 1980s (molecular formula C50H69N15O9; MW approximately 1024 g/mol; CAS 121062-08-6). MT-II acts as a non-selec

Deep dive · 19 October 2026 · Melanotan II

Glycine (aminoacetic acid) is the simplest proteinogenic amino acid and a major inhibitory neurotransmitter in the spinal cord and brainstem, acting at strychnine-sensitive glycine receptors (GlyRs). Its sleep-promoting properties, however, appear to arise through a pharmacologic

Deep dive · 19 October 2026 · Glycine Peptide

Thymosin alpha-1 (Ta1) is a 28-amino-acid peptide cleaved from its 113-residue precursor prothymosin alpha within the thymus, carrying an N-terminal acetyl group and a molecular weight of approximately 3,108 daltons. At the molecular level, Ta1 acts as a toll-like receptor (TLR)

Deep dive · 19 October 2026 · Thymosin Alpha-1

Gonadorelin is a synthetic decapeptide (molecular formula C55H75N17O13) with an amino acid sequence identical to endogenous gonadotropin-releasing hormone (GnRH), the neuropeptide secreted in intermittent pulses by the hypothalamus. It binds to GnRH receptors on gonadotroph cell

Deep dive · 19 October 2026 · Gonadorelin

Sermorelin is a synthetic 29-amino acid peptide constituting the biologically active N-terminal fragment of human growth hormone-releasing hormone (GHRH). Despite representing only positions 1 through 29 of the 44-residue parent molecule, this fragment retains essentially full ag

Deep dive · 19 October 2026 · Sermorelin