AssayIndex
Growth-hormone axis peptides

GHRP-6

growth hormone releasing hexapeptide · SKF-110679 · C46H56N12O6 · monoisotopic 872.4446 Da. The index holds 206 assay reports on this compound across 36 batches from 20 suppliers.

206 reports36 batchesmedian 99.54 %index spec 99.0 %
Section 1

Analytical fingerprint

Hand-authored chemistry. These properties describe the substance and do not change when a record is added.

GHRP-6 has two tryptophans and shows the same oxidation ladder as MOTS-c. It is the index's most-submitted secretagogue and its purity distribution is the tightest of any compound tracked (IQR 0.4 pp), which makes it the best available control for detecting a lab's integration bias: a lab whose GHRP-6 median differs from the index median by more than 0.3 pp is almost certainly integrating differently, not measuring different material.

Molecular formula
C46H56N12O6
Monoisotopic mass
872.4446Da
Average mass
873.01Da
Residues
6
Nominal retention (RG-2, 30 min)
8.44min
Retention window
0.25min
Counter-ion as usually shipped
acetate
Typical label claims
2 mg · 5 mg · 10 mg
Analytical difficulty (index scale)
0.85 — straightforward
Purity is a defined quantity
YES
Section 2

Representative chromatogram

Drawn from this page's own medians. Not a scan, not an illustration, and not any single report.

031856370955512739 GHRP-68.44 min · 99.54 % 8.10 same trace · ×200 vertical expansion, baseline-corrected · main peak off-scale reporting threshold 0.05 % area 05101520253035 Retention time (min) Response (mAU)
Figure 1. A representative GHRP-6 trace on the index reference method RG-2, constructed from this page's own numbers: the main peak carries the index median purity of 99.54 % area at the nominal retention time of 8.44 min, and each impurity peak carries the median area the index has observed for that named species at its characteristic retention offset. It is not a scan of any single report — every individual record's own chromatogram is on its own page. The lower panel is the same trace at a stated vertical expansion, baseline-corrected, so the impurities are visible; the main peak runs off-scale there by design. Baseline noise is seeded from the compound slug.
Section 3

What the index has observed

Arithmetic over the 206 records the index holds. Aggregates on this page are computed over the records the index holds, which are not a random sample of the material on the market. Lots that get tested are lots someone chose to test. Read every figure here as a description of this dataset rather than as an estimate of a population.

Median purity 99.54% n=206
Interquartile range 0.51pp n=206
Minimum 98.42% n=206
Maximum 99.93% n=206
Pass rate vs spec 87.4% n=206
Median recovery vs claim 97.3% n=110
Median water 5.05% n=206
Median |mass error| 2.5ppm n=168
018365492.093.094.095.096.097.098.099.0100.092.00–92.25 %: n=092.25–92.50 %: n=092.50–92.75 %: n=092.75–93.00 %: n=093.00–93.25 %: n=093.25–93.50 %: n=093.50–93.75 %: n=093.75–94.00 %: n=094.00–94.25 %: n=094.25–94.50 %: n=094.50–94.75 %: n=094.75–95.00 %: n=095.00–95.25 %: n=095.25–95.50 %: n=095.50–95.75 %: n=095.75–96.00 %: n=096.00–96.25 %: n=096.25–96.50 %: n=096.50–96.75 %: n=096.75–97.00 %: n=097.00–97.25 %: n=097.25–97.50 %: n=097.50–97.75 %: n=097.75–98.00 %: n=098.00–98.25 %: n=098.25–98.50 %: n=498.50–98.75 %: n=1198.75–99.00 %: n=1199.00–99.25 %: n=2299.25–99.50 %: n=4599.50–99.75 %: n=5299.75–100.00 %: n=61median 99.54 Purity (% area) Reports
Figure 2. Purity distribution across all 206 GHRP-6 records. Dashed line is this compound's median (99.54 %); the solid vertical is the index acceptance specification for the growth-hormone axis peptides class (99.0 %). Domain is fixed at 92–100 % on every purity histogram on this site so that compounds can be compared by eye — a wide distribution here is a hard compound, a narrow one is an easy one, and neither is a statement about the suppliers.
Section 4

By supplier

Suppliers with fewer than two purity records on this compound are omitted from the figure rather than drawn as a line. The full table, including the thin cells, is on the by-supplier page.

98.398.698.999.299.599.8100.1AMBAMB: Q1 99.36, median 99.45, Q3 99.67, n=32outlier 98.81n=32QYBQYB: Q1 99.33, median 99.48, Q3 99.69, n=27n=27CPCCPC: Q1 99.61, median 99.80, Q3 99.93, n=18n=18QSCQSC: Q1 99.73, median 99.77, Q3 99.93, n=17outlier 99.29n=17SGNSGN: Q1 98.90, median 99.17, Q3 99.42, n=16n=16FGPFGP: Q1 99.64, median 99.87, Q3 99.93, n=15n=15JEEPJEEP: Q1 99.33, median 99.42, Q3 99.50, n=13outlier 99.04n=13PPGPPG: Q1 99.58, median 99.65, Q3 99.86, n=11n=11GSPGSP: Q1 99.48, median 99.57, Q3 99.69, n=11n=11HomopeptideHomopeptide: Q1 99.78, median 99.89, Q3 99.93, n=11outlier 99.54n=11ERPERP: Q1 98.64, median 98.83, Q3 98.94, n=9n=9HJHJ: Q1 99.21, median 99.37, Q3 99.52, n=5outlier 98.69n=5WXTWXT: Q1 99.03, median 99.04, Q3 99.10, n=5outlier 98.42outlier 99.31n=5BCHBCH: Q1 98.70, median 98.75, Q3 98.87, n=4n=4KPKP: Q1 98.44, median 98.49, Q3 98.56, n=4n=4WWBWWB: Q1 99.72, median 99.73, Q3 99.76, n=3n=3HYBHYB: Q1 99.83, median 99.87, Q3 99.90, n=2n=2 Purity (% area)
Figure 3. GHRP-6 purity by supplier, ordered by coverage. The vertical line is the index acceptance specification. Boxes that overlap are suppliers this dataset cannot separate, and most of them overlap.

Full per-supplier table with n= caveats →

Section 5

Characteristic impurities and degradants

The left three columns are authored chemistry — what this molecule characteristically carries and where it elutes. The right three are what the index has actually reported.

Named speciesΔRT (min, RG-2)Δ mass (Da)Seen inMedian % areaMax % area
[D-Trp]-epimer-0.12mass-identical93%0.080.95
oxidised Trp (+16 Da)-0.34+15.99591%0.130.89
des-Lys (−128 Da)-0.22-128.09588%0.061.11
bis-oxidised Trp (+32 Da)-0.58+31.99084%0.071.03

Degradation pathways

  • double Trp oxidation — GHRP-6 has two, and both go
  • C-terminal amide hydrolysis

Full impurity profile, with what each named species implies about the synthesis →

Section 7

Quarterly coverage

QuarterReportsMedian purityRange
2024-Q1699.2098.91–99.42
2024-Q21699.6199.32–99.93
2024-Q32199.7198.51–99.93
2024-Q42099.6498.42–99.93
2025-Q1399.1498.90–99.54
2025-Q23899.5098.95–99.93
2025-Q33299.5398.43–99.93
2025-Q42799.8099.21–99.93
2026-Q11599.1898.42–99.82
2026-Q21499.7298.64–99.93
2026-Q31499.3798.69–99.93

Quarter-by-quarter detail →

Section 8

Most recent records

The 25 most recent GHRP-6 records of 206.
ReportSupplierLotLabQuarterPurity %Water %Recovery %ProvenanceFlagsResult
AX-2026-042012AMBAMB-2603-S5667Janoshik2026-Q399.375.9088.8Laboratory-retained1MARGINAL
AX-2026-042528HJHJ-2603-R5329VendorInvestigate2026-Q398.691.8795.8Buyer-sourced0FAIL
AX-2026-042015AMBAMB-2603-S5667Janoshik2026-Q399.546.4497.1Buyer-sourced0PASS
AX-2026-042526HJHJ-2603-R5329Medutest2026-Q399.373.06—Laboratory-retained0PASS
AX-2026-042527HJHJ-2603-R5329VendorInvestigate2026-Q399.212.7793.2Buyer-sourced0PASS
AX-2026-042525HJHJ-2603-R5329Janoshik2026-Q399.523.2492.0Buyer-sourced0PASS
AX-2026-042013AMBAMB-2603-S5667Kestrel2026-Q399.935.75—Buyer-sourced0PASS
AX-2026-042017AMBAMB-2603-S5667Medutest2026-Q399.766.4297.4Buyer-sourced0PASS
AX-2026-042019AMBAMB-2603-S5667PeptideMeter2026-Q398.816.11—Buyer-sourced0FAIL
AX-2026-042011AMBAMB-2603-S5667Medutest2026-Q399.376.38—Buyer-sourced1MARGINAL
AX-2026-042016AMBAMB-2603-S5667PeptideMeter2026-Q399.346.5897.3Buyer-sourced0PASS
AX-2026-042529HJHJ-2603-R5329Janoshik2026-Q399.572.45—Buyer-sourced0PASS
AX-2026-042018AMBAMB-2603-S5667Medutest2026-Q399.566.5798.3Buyer-sourced1FAIL
AX-2026-042014AMBAMB-2603-S5667PeptideMeter2026-Q399.246.62—Buyer-sourced0PASS
AX-2026-041549QSCQSC-2605-A6715Medutest2026-Q299.934.83—Buyer-sourced0PASS
AX-2026-041555QSCQSC-2605-A6715PeptideMeter2026-Q299.935.2592.1Buyer-sourced0PASS
AX-2026-041551QSCQSC-2605-A6715Janoshik2026-Q299.744.60105.7Buyer-sourced0PASS
AX-2026-043496BCHBCH-2603-Y4946Medutest2026-Q298.795.25—Buyer-sourced2FAIL
AX-2026-041548QSCQSC-2605-A6715Janoshik2026-Q299.715.0788.7Buyer-sourced1MARGINAL
AX-2026-043495BCHBCH-2603-Y4946Janoshik2026-Q298.645.25—Laboratory-retained1FAIL
AX-2026-041550QSCQSC-2605-A6715Janoshik2026-Q299.775.00101.8Buyer-sourced0PASS
AX-2026-041556QSCQSC-2605-A6715PeptideMeter2026-Q299.294.30—Buyer-sourced0PASS
AX-2026-041557QSCQSC-2605-A6715Medutest2026-Q299.734.8894.5Buyer-sourced0PASS
AX-2026-043494BCHBCH-2603-Y4946Janoshik2026-Q299.115.26—Supplier-supplied1MARGINAL
AX-2026-041553QSCQSC-2605-A6715VendorInvestigate2026-Q299.934.9592.4Buyer-sourced0PASS