Buyer's Guide · 2026

The ten peptides actually being researched in 2026.

Q: What payment methods does IGF1 Shop accept?

Bitcoin, Monero, Ethereum, USDT (TRC-20/ERC-20/SOL), Solana, Litecoin and several other cryptocurrencies. Bank wire and card available on institutional orders. Free shipping on orders above US$59 worldwide; 48-hour US delivery, 5-business-day international.

Q: Are these peptides legal?

IGF1 Shop sells research-grade peptides for in-vitro laboratory work only, not for human or veterinary use. Legality of importation, possession and use varies by jurisdiction; the buyer is responsible for compliance with local law. Several listed compounds (Retatrutide, Tesamorelin) are investigational drugs in clinical trials and are not approved for human use outside trial protocols.

Q: How quickly does IGF1 Shop ship?

Same-business-day dispatch when crypto payment confirms before 14:00 CET. UPS Next Day Air to the US (48-hour transit), DHL Express Worldwide internationally (5 business days). Discreet insulated packaging, no compound name on the outer label, full tracking included.

A side-by-side comparison of mechanism, half-life, dose range, sequence and lab-verified purity for the compounds that account for the bulk of catalog shipments — not a marketing list, the ones with the citations to back them.

See the comparison table Full catalog (34)

10Top compounds ranked

≥ 99%HPLC purity floor

3Independent assays / lot

11Languages available

Quick Answer

In one sentence: The ten most-cited research peptides of 2026 are BPC-157 (tissue repair), IGF-1 LR3 (anabolic signalling), Retatrutide (triple-agonist metabolic), Ipamorelin (GH pulsatility), MT-2 (melanocortin), GHK-Cu (skin / wound), TB-500 (actin-cytoskeleton), Tesamorelin (FDA-approved GHRH), MOTS-c (mitochondrial AMPK) and Semax (BDNF / cognition); all ten are stocked at IGF1 Shop with per-lot HPLC ≥99% purity and ESI mass-spec confirmation.

Most-cited overall: BPC-157 leads PubMed entries for tissue-repair research.
Highest weight-loss data: Retatrutide — 24.2% mean placebo-adjusted weight loss at 48 weeks (Phase 2, NEJM 2023).
Longest half-life: Retatrutide ~6 days · MT-2 ~30 h · IGF-1 LR3 ~20 h serum.
Cleanest GH secretagogue: Ipamorelin — selective GHS-R1a, no measurable prolactin or cortisol elevation.

Top 10 ranking

Side-by-side comparison.

Compounds ranked by combined PubMed citation count, clinical-trial enrolment and our own customer order volume in 2026. Sortable specs below.

#	Compound	Primary research use	Mechanism	Half-life	Sequence	Price (1 vial)
1	BPC-157 5 mg / vial	Soft-tissue repair · gut-lining · vascular healing	Upregulates VEGFR-2 and nitric oxide synthase, accelerating angiogenesis in injured tissue.	~4 h SC	15 aa	$21
2	IGF-1 LR3 1 mg / vial	Anabolic signalling · hypertrophy · MPS assays	Binds IGF-1R with reduced IGFBP affinity, prolonging activation of PI3K/Akt and MAPK pathways.	~20 h serum	83 aa	$60
3	3-GLP (Retatrutide) 10 mg / vial	Metabolic disease · GLP-1 axis · weight regulation	Triple agonism of GLP-1R/GIPR/GCGR drives appetite suppression, insulin sensitivity, and energy expenditure simultaneously.	~6 days (weekly)	39 aa	$67
4	Ipamorelin 5 mg / vial	GH-axis · pulsatile secretion · hypothalamic signalling	Selective GHS-R1a agonism without ACTH/cortisol crosstalk, unlike older secretagogues such as GHRP-6.	~2 h serum	5 aa	$21
5	Melanotan II (MT-2) 10 mg / vial	Melanocortin receptors · pigmentation · MC4R behaviour	Pan-melanocortin agonism with the strongest documented affinity at MC1R driving eumelanin synthesis.	~30 h SC	7 aa (cyclic)	$25
6	GHK-Cu (Copper Peptide) 50 mg 50 mg / vial	Skin-aging · wound repair · hair-follicle activation	Modulates 4192 of 23987 measured human genes (Pickart microarray, 2008) toward a wound-healing transcriptomic profile.	Topical / local	3 aa + Cu²⁺	$25
7	TB-500 (Thymosin β-4 Fragment) 5 mg / vial	Tissue repair · actin cytoskeleton · equine veterinary	Actin-monomer sequestration via the LKKTET motif, mobilising stem-cell migration to injury sites.	~2.5 h IV	17 aa	$32
8	Tesamorelin 5 mg / vial	GHRH axis · visceral fat · IGF-1 stimulation	Selective GHRH-R agonism producing pulsatile somatotropin release without GHRP-style ghrelin-axis crosstalk.	~38 min serum	44 aa	$35
9	MOTS-c 10 mg / vial	Mitochondrial biology · metabolic aging · AMPK	Activates AMPK and folate-cycle genes, mimicking the metabolic effects of caloric restriction.	~30 min serum	16 aa	$32
10	Semax 5 mg / vial	BDNF research · neuroprotection · attention/cognition	Increases hippocampal BDNF expression and modulates the HPA axis without ACTH steroidogenic activity.	~30 min serum	7 aa	$21

Deep dive

What each peptide actually is.

Atomic, citation-friendly facts for the work in front of you — definition first, then mechanism, half-life, typical research dose and a verbatim-quotable summary.

BPC-157

5 mg / vial · Healing & Recovery

BPC-157 is a 15-amino-acid pentadecapeptide derived from human gastric juice with documented angiogenic and tendon-repair activity in rodent models.

Mechanism: Upregulates VEGFR-2 and nitric oxide synthase, accelerating angiogenesis in injured tissue.
Half-life: ~4 h SC
Research dose: 250–500 µg, 1–2× daily
Sequence: 15 aa

BPC-157, originally isolated from gastric juice (Sikiric et al., 1991), shows reproducible tendon-repair acceleration in rat Achilles models at 10 µg/kg.

View specs Sample COA

IGF-1 LR3

1 mg / vial · Growth & Anabolic

IGF-1 LR3 is a 83-residue insulin-like growth factor analogue with an N-terminal Arg substitution that extends serum half-life roughly 12-fold versus native IGF-1.

Mechanism: Binds IGF-1R with reduced IGFBP affinity, prolonging activation of PI3K/Akt and MAPK pathways.
Half-life: ~20 h serum
Research dose: 40–80 µg/day
Sequence: 83 aa

IGF-1 LR3 binds IGFBPs ~5× less avidly than wild-type IGF-1, leaving a higher free fraction and a measured half-life near 20 hours in human serum.

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3-GLP (Retatrutide)

10 mg / vial · Metabolic & Weight

Retatrutide (LY3437943) is a triple-agonist peptide co-activating GLP-1, GIP, and glucagon receptors, the first triagonist to advance into Phase 3 obesity trials.

Mechanism: Triple agonism of GLP-1R/GIPR/GCGR drives appetite suppression, insulin sensitivity, and energy expenditure simultaneously.
Half-life: ~6 days (weekly)
Research dose: 0.25–12 mg weekly
Sequence: 39 aa

Retatrutide produced 24.2% mean placebo-adjusted weight loss at 48 weeks in the Phase 2 trial (Jastreboff et al., NEJM 2023), the largest observed for any incretin to date.

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Ipamorelin

5 mg / vial · Growth & Anabolic

Ipamorelin is a selective ghrelin/GHS-R1a agonist pentapeptide that stimulates pulsatile growth-hormone release without elevating cortisol or prolactin.

Mechanism: Selective GHS-R1a agonism without ACTH/cortisol crosstalk, unlike older secretagogues such as GHRP-6.
Half-life: ~2 h serum
Research dose: 200–300 µg, 2–3× daily
Sequence: 5 aa

Ipamorelin demonstrates the cleanest selectivity profile among ghrelin mimetics, with no measurable effect on prolactin or cortisol at GH-active doses.

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Melanotan II (MT-2)

10 mg / vial · Skin & Cosmetic

Melanotan II (MT-2) is a synthetic alpha-MSH analogue activating MC1R/MC3R/MC4R/MC5R; the MC1R activation drives the melanogenesis pigmentation effect studied in dermatology models.

Mechanism: Pan-melanocortin agonism with the strongest documented affinity at MC1R driving eumelanin synthesis.
Half-life: ~30 h SC
Research dose: 0.25–1 mg subcutaneous
Sequence: 7 aa (cyclic)

MT-2 retains nanomolar affinity at MC1R, MC3R, MC4R and MC5R, producing pigmentation, appetite suppression and pro-erectile responses in concert.

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GHK-Cu (Copper Peptide) 50 mg

50 mg / vial · Healing & Recovery

GHK-Cu (copper tripeptide-1) is a glycyl-histidyl-lysine sequence chelated to Cu²⁺, with documented gene-modulating activity across 4 192 human genes (Pickart 2008).

Mechanism: Modulates 4192 of 23987 measured human genes (Pickart microarray, 2008) toward a wound-healing transcriptomic profile.
Half-life: Topical / local
Research dose: Topical 0.05–2% formulations
Sequence: 3 aa + Cu²⁺

GHK-Cu shifted the expression of 4 192 human genes by ≥50% in a 2008 microarray study by Pickart, the broadest known transcriptomic effect of a tripeptide.

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TB-500 (Thymosin β-4 Fragment)

5 mg / vial · Healing & Recovery

TB-500 is a synthetic 17-amino-acid fragment (residues 17–23 of native Thymosin Beta-4), representing the actin-binding region responsible for cell migration during repair.

Mechanism: Actin-monomer sequestration via the LKKTET motif, mobilising stem-cell migration to injury sites.
Half-life: ~2.5 h IV
Research dose: 2–5 mg twice weekly
Sequence: 17 aa

TB-500 contains the LKKTET actin-binding motif (residues 17–23 of Thymosin Beta-4) that drives stem-cell migration to injury sites in vivo.

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Tesamorelin

5 mg / vial · Growth & Anabolic

Tesamorelin is a 44-amino-acid trans-3-hexenoyl-modified GHRH analogue, the only GHRH analogue with FDA approval (HIV-associated lipodystrophy, 2010).

Mechanism: Selective GHRH-R agonism producing pulsatile somatotropin release without GHRP-style ghrelin-axis crosstalk.
Half-life: ~38 min serum
Research dose: 1–2 mg subcutaneous daily
Sequence: 44 aa

Tesamorelin reduces visceral adipose tissue by 18% at 26 weeks in HIV-lipodystrophy patients (Falutz NEJM 2007), the only GHRH analogue cleared by the FDA.

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MOTS-c

10 mg / vial · Growth & Anabolic

MOTS-c is a 16-amino-acid mitochondrial-derived peptide encoded in the 12S rRNA region, regulating insulin sensitivity via AMPK activation.

Mechanism: Activates AMPK and folate-cycle genes, mimicking the metabolic effects of caloric restriction.
Half-life: ~30 min serum
Research dose: 5–10 mg subcutaneous
Sequence: 16 aa

MOTS-c is encoded within the mitochondrial 12S rRNA gene (Lee et al., Cell Metabolism 2015) and signals from mitochondria to the nucleus to regulate insulin sensitivity.

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Semax

5 mg / vial · Cognitive & Sleep

#10

Semax is a 7-amino-acid synthetic ACTH(4-7) analogue developed at the Russian Academy of Sciences, used in BDNF-modulation and stroke-recovery research.

Mechanism: Increases hippocampal BDNF expression and modulates the HPA axis without ACTH steroidogenic activity.
Half-life: ~30 min serum
Research dose: 300–600 µg intranasal daily
Sequence: 7 aa

Semax is included on the Russian Vital and Essential Drugs list and is studied for stroke recovery and ADHD; it elevates hippocampal BDNF by ~1.5× in murine models.

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FAQ

Common buyer questions.

Which research peptide is most studied in 2026?

BPC-157 leads PubMed citations for tissue-repair research; Retatrutide leads clinical-trial enrolment in metabolic disease; IGF-1 LR3 leads anabolic-signalling research. All three are HPLC-verified at ≥99% purity in the IGF1 Shop catalog with per-lot Certificate of Analysis included.

What is the difference between IGF-1 and IGF-1 LR3?

IGF-1 LR3 has an Arginine substitution at position 3 of native IGF-1 plus a 13-residue N-terminal extension (Arg-residue-extension), reducing affinity for IGFBPs by ~5× and extending serum half-life from ~10 minutes (native) to ~20 hours (LR3). Both bind the same IGF-1 receptor.

Is Retatrutide better than Tirzepatide?

In the Phase 2 trial (Jastreboff et al., NEJM 2023) Retatrutide produced 24.2% mean weight loss at 48 weeks at the 12 mg dose, exceeding the 22.5% reported for Tirzepatide at 72 weeks (SURMOUNT-1, Jastreboff NEJM 2022). Retatrutide is a triple agonist (GLP-1/GIP/Glucagon) versus Tirzepatide's dual agonism (GLP-1/GIP).

How is purity verified on these peptides?

Every IGF1 Shop lot is analysed by reverse-phase HPLC at 220 nm against a reference standard (≥99% area-percent purity floor), confirmed by ESI mass spectrometry to within ±1 Da of theoretical molecular weight, and screened for endotoxin by the kinetic chromogenic LAL assay (<0.5 EU/mg). The chromatogram, MS trace, and LAL result ship with each order on the per-lot Certificate of Analysis.

What payment methods does IGF1 Shop accept?

Bitcoin, Monero, Ethereum, USDT (TRC-20/ERC-20/SOL), Solana, Litecoin and several other cryptocurrencies. Bank wire and card available on institutional orders. Free shipping on orders above US$59 worldwide; 48-hour US delivery, 5-business-day international.

Are these peptides legal?

IGF1 Shop sells research-grade peptides for in-vitro laboratory work only, not for human or veterinary use. Legality of importation, possession and use varies by jurisdiction; the buyer is responsible for compliance with local law. Several listed compounds (Retatrutide, Tesamorelin) are investigational drugs in clinical trials and are not approved for human use outside trial protocols.

How quickly does IGF1 Shop ship?

Same-business-day dispatch when crypto payment confirms before 14:00 CET. UPS Next Day Air to the US (48-hour transit), DHL Express Worldwide internationally (5 business days). Discreet insulated packaging, no compound name on the outer label, full tracking included.

The ten peptides actually being researched in 2026.

Side-by-side comparison.

What each peptide actually is.

Every compound here is lab-verified before release.

Common buyer questions.