t.zielinski94/100
Regional stock makes the difference — dispatched within Germany, day 3, cold pack still hard on arrival.
GGPeps — Nantong Guangyuan Chemical Co., Ltd.
Nantong, CN. The index holds 567 assay reports across 85 batches and 33 compounds, contributed by 6 laboratories. Every figure below is computed from those records and from nothing else.
Where GGPeps sells
Nantong Guangyuan Chemical Co., Ltd. sells from its own storefront. The link is marked nofollow and sponsored: it exists so the figures on this scorecard can be read against what the supplier itself publishes. The index is paid nothing for it and a link is not an assessment.
Every figure above describes lots the index has seen. It says nothing about the lot you are offered, and the only check that does is the one on the certificate against the vial.
Block 1
Identification
Business facts, held constant across the index and not derived from the data. The index sells nothing and takes no supplier payment for placement; the storefront link below is marked nofollow and sponsored so a record can be checked against the seller, and is not a recommendation.
- Legal name
- Nantong Guangyuan Chemical Co., Ltd.
- Short code in this index
- GGPeps
- Also known as
- GGPeps · GYC · GYC Peptides · Guangyuan Chemical
- Domain
- ggpeps.net →
- City
- Nantong
- Region
- Jiangsu
- Country
- CN
- Established
- not stated
- First record in index
- 20 Apr 2024
- Most recent record
- 18 Oct 2026
Block 1b
Dispatch and warehouses
Where the supplier holds regional stock. Material assayed by the index is dispatched from these locations, not from the manufacturing site.
- Netherlands (Rotterdam) — European Union, 2-4 days
- Germany (Hamburg) — Germany, Austria, Switzerland, 2-4 days
- United Kingdom (London) — United Kingdom & Ireland, 2-3 days
- United States (California) — United States, 2-4 days
- Canada (Toronto) — Canada, 3-5 days
- Australia (Melbourne) — Australia & New Zealand, 3-5 days
Block 2
Headline statistics
Each figure carries the n it was computed from. The n= badge next to a statistic is the number of records it was computed from. Below n=8 the badge is amber. Below n=3 the statistic is suppressed and the individual values are shown instead.
Median purity
98.68%
n=567
Interquartile range
1.04pp
n=567
10th percentile
97.75%
n=567
Pass rate vs index spec
86.9%
n=567
Median recovery vs claim
98.4%
n=323
Median water
4.60%
n=567
Median |mass error|
2.7ppm
n=481
Records carrying a flag
78.0%
n=567
Block 3
Reproducibility across independent tests of one lot
Where the same physical lot was assayed more than once, the spread between those results is a property of the material and the fill, not of the market. It is the rarest and most informative statistic on this page, and it exists only for lots someone tested twice.
Median within-batch spread
1.01pp
n=69
Index median spread
0.95pp
n=20
Lots tested 3+ times
69
n=85
Across the 69 GGPeps lots in the index with three or more independent assays, the median spread between the highest and lowest purity result on one lot is 1.01 pp. Interpreting that number requires the laboratory repeatability figures: the best contributing laboratory here repeats to 0.16 pp and the worst to 0.34 pp, so a within-lot spread under about 0.5 pp is indistinguishable from measurement noise and a spread above 1 pp is a statement about the material.
Block 4
Supplier certificate against independent measurement
The supplier's own COA purity figure for a lot, minus the median of the index's independent observations of the same physical lot. Positive means the certificate reads higher than the measurement. Rule AX-R05 fires above 1.5 pp.
Median COA divergence
+0.35pp
n=85
Index median divergence
+0.31pp
n=20
Divergences in the supplier's favour
88%
n=85
Divergences beyond 1 pp
1%
n=85
Block 5
Provenance — where the tested material came from
Supplier-supplied samples are weaker evidence than independently purchased ones, because the supplier chose the vial. The index measures the size of that effect rather than assuming it.
Buyer-sourced median
98.32%
n=87
Supplier-supplied median
98.76%
n=458
Supplier-supplied share of records
80.8%
n=567
Block 6
Documentation completeness
The score is not an opinion about paperwork. Each component is the share of GGPeps batches in the index whose certificate carries that field, weighted as set out on the scoring rubric.
Documentation score
77/100
n=85
Index median score
79/100
n=20
| Certificate field | Batches carrying it | Rubric weight | |
|---|---|---|---|
| Purity figure stated | 100% | 25 points | |
| Analytical method stated (column, gradient, wavelength) | 68% | 25 points | |
| Peptide content stated | 61% | 20 points | |
| Endotoxin stated | 32% | 15 points | |
| Named impurities rather than a total | 40% | 15 points |
Block 7
Coverage by compound
The delta column is this supplier's median minus the index-wide median for the same compound, which is the only comparison worth making: comparing a supplier's aggregate against another supplier's aggregate compares their product mixes as much as their process control.
| Compound | Class | Reports | Median % | Index median % | Δ (pp) | Index spec | Pass % |
|---|---|---|---|---|---|---|---|
| Retatrutide | Incretin | 92 | 98.19 | 98.41 | -0.22 | 96.5 | 99 |
| BPC-157 | Tissue-repair | 71 | 99.06 | 99.15 | -0.09 | 98.0 | 96 |
| Semaglutide | Incretin | 50 | 98.25 | 98.87 | -0.62 | 97.0 | 100 |
| Tirzepatide | Incretin | 36 | 98.40 | 98.44 | -0.05 | 97.0 | 100 |
| KPV | Tissue-repair | 24 | 98.61 | 99.21 | -0.60 | 99.0 | 17 |
| Selank | Neuroactive | 23 | 98.88 | 99.13 | -0.25 | 99.0 | 48 |
| MK-677 (Ibutamoren mesylate) | Non-peptide | 22 | 99.51 | 99.37 | +0.14 | 98.5 | 91 |
| CJC-1295 (no DAC) | Growth-hormone | 20 | 98.23 | 98.61 | -0.38 | 98.0 | 70 |
| Liraglutide | Incretin | 20 | 98.55 | 99.02 | -0.47 | 97.5 | 100 |
| TB-500 | Tissue-repair | 19 | 99.52 | 99.47 | +0.05 | 98.5 | 100 |
| Semax | Neuroactive | 19 | 98.63 | 99.17 | -0.54 | 98.5 | 53 |
| Melanotan II | Melanocortin-receptor | 16 | 99.23 | 99.24 | -0.01 | 98.5 | 69 |
| Sermorelin | Growth-hormone | 15 | 98.83 | 98.94 | -0.11 | 98.0 | 100 |
| Enclomiphene citrate | Non-peptide | 14 | 99.09 | 99.23 | -0.14 | 98.5 | 64 |
| Cagrilintide | Incretin | 13 | 98.10 | 98.59 | -0.49 | 96.5 | 100 |
| MOTS-c | Metabolic | 13 | 98.74 | 99.18 | -0.44 | 98.0 | 100 |
| SLU-PP-332 | Non-peptide | 12 | 98.65 | 98.69 | -0.03 | 98.0 | 100 |
| CJC-1295 with DAC | Growth-hormone | 12 | 98.00 | 98.79 | -0.79 | 97.5 | 83 |
| Ipamorelin | Growth-hormone | 12 | 99.41 | 99.48 | -0.07 | 99.0 | 75 |
| ARA-290 | Tissue-repair | 11 | 99.03 | 99.45 | -0.42 | 98.0 | 100 |
| NAD+ | Non-peptide | 10 | 98.19 | 98.88 | -0.69 | 97.0 | 100 |
| IGF-1 LR3 | Growth-hormone | 9 | 98.11 | 97.75 | +0.36 | 95.0 | 100 |
| Humanin (HNG) | Metabolic | 7 n=7 | 99.22 | 99.47 | -0.25 | 97.5 | 100 |
| Survodutide | Incretin | 5 n=5 | 97.74 | 98.69 | -0.95 | 96.5 | 100 |
| N-Acetyl Semax Amide | Neuroactive | 4 n=4 | 98.71 | 99.26 | -0.55 | 98.5 | 75 |
| Thymulin | Tissue-repair | 4 n=4 | 98.72 | 99.06 | -0.35 | 98.0 | 100 |
| Desmopressin | Hypothalamic | 4 n=4 | 99.41 | 99.46 | -0.05 | 98.5 | 75 |
| 5-Amino-1MQ | Non-peptide | 2 n=2 | n<3 | 99.24 | — | 98.0 | 100 |
| GHRP-6 | Growth-hormone | 2 n=2 | n<3 | 99.65 | — | 99.0 | 0 |
| L-Glutathione (reduced) | Short | 2 n=2 | n<3 | 99.00 | — | 98.5 | 50 |
| Hexarelin | Growth-hormone | 2 n=2 | n<3 | 98.72 | — | 99.0 | 50 |
| MGF | Growth-hormone | 1 n=1 | n<3 | 98.73 | — | 97.5 | 100 |
| GHRP-2 | Growth-hormone | 1 n=1 | n<3 | 99.22 | — | 99.0 | 100 |
Full per-compound breakdown with distributions and caveats →
Block 8
Quarterly trend
Submission volume is not market share and a quarterly median is not a trend unless the compound mix held still. Both caveats apply to every row below.
Median purity by quarter
Quarters with fewer than two purity records are gaps in the line rather than zeroes.
Coverage growth
Records added per quarter. Growth here is index coverage, not supplier volume.
| Quarter | Batches | Reports | Median purity | Range | Flagged |
|---|---|---|---|---|---|
| 2024-Q1 | 0 | 0 | n<3 | — | 0 |
| 2024-Q2 | 3 | 10 | 99.19 | 98.23–99.93 | 10 |
| 2024-Q3 | 4 | 43 | 98.05 | 97.45–99.93 | 36 |
| 2024-Q4 | 7 | 34 | 98.52 | 97.58–99.56 | 19 |
| 2025-Q1 | 7 | 29 | 98.47 | 97.91–99.80 | 25 |
| 2025-Q2 | 5 | 35 | 98.72 | 97.71–99.93 | 21 |
| 2025-Q3 | 4 | 42 | 99.06 | 97.37–99.93 | 42 |
| 2025-Q4 | 11 | 75 | 98.83 | 97.46–99.93 | 54 |
| 2026-Q1 | 13 | 101 | 98.70 | 96.42–99.93 | 81 |
| 2026-Q2 | 27 | 161 | 98.68 | 97.10–99.93 | 136 |
| 2026-Q3 | 4 | 37 | 98.60 | 97.75–99.86 | 18 |
Block 9
Which laboratory produced these numbers
Laboratories disagree with each other by a measured amount. A supplier tested mostly by one laboratory carries that laboratory's offset in its aggregate, and the adjusted column removes it.
| Laboratory | Reports | Median purity | Lab bias (pp) | Bias-adjusted |
|---|---|---|---|---|
| Janoshik | 277 | 98.59 | +0.00 | 98.59 |
| PeptideMeter | 89 | 98.78 | -0.05 | 98.83 |
| Medutest | 84 | 98.79 | +0.08 | 98.71 |
| VendorInvestigate | 41 | 98.32 | -0.11 | 98.43 |
| Nordanalyt | 43 | 98.63 | +0.02 | 98.61 |
| Kestrel | 33 | 99.28 | +0.24 | 99.04 |
Bias figures are estimated from paired same-lot comparisons and are published with their confidence intervals on inter-lab agreement.
Block 10
What this data does and does not show
Block 11
On-the-record reviews 26
Reviews are signed statements from index contributors about their own testing of this supplier's material. They are opinions attached to evidence, and they are not used in any statistic on this page.
93.0/ 1001,458 ratings across the index network
s.weiss94/100
Identity confirmed by mass spec on the certificate, not just an area-percent figure. Both questions answered on one page.
k.kravchenko94/100
Same lot documentation as the factory ships, but out of their warehouse in the United States, so it landed on day 4.
n.okonkwo90/100
Held locally in Australia, so the IGF-1 LR3 1 mg arrived on day 3 without an import step.
y.bergstrom90/100
Everything about the order was routine in the best sense — quoted 5 days, arrived in 5.
h.lundgren94/100
First order, deliberately small, BPC-157 10 mg only. Documentation, transit and a PeptideMeter result at 99.5% all checked out, so the next one will not be small.
ta.kaufmann94/100
Three compounds on one invoice, all three lot-matched to their own certificates, all three inside spec on independent testing.
t.malinowski90/100
Steady supplier. Medutest results have agreed with their stated figures on every lot I have submitted.
a.lehtinen94/100
Reconstituted the MOTS-c 10 mg and it went clear on contact — no haze, no floaters, no long swirl. Tells you the lyophilisation was done properly.
m.nyberg90/100
Straightforward order, arrived as described, documentation adequate and complete. Nothing to add, which is the point.
r.lokken90/100
Domestic dispatch from their stock in Australia. Straightforward, day 4, exactly as quoted.
s.adeyemi94/100
Custom synthesis quote came back with a realistic timeline and they beat it. Purity on delivery matched the signed spec.
a.castellanos90/100
Ordered semax 10 mg twice. Both vials reconstituted cleanly and both matched their certificates.
v.nwosu94/100
Shipped with a stated storage recommendation and a shelf-life figure tied to it, without my asking.
h.kravchenko94/100
Every certificate I have from them is lot-specific. Not one batch-level document in 4 orders.
m.vermeulen94/100
Vials wrapped individually, foam cut to fit, nothing loose in the box. Packing that has clearly been thought about.
p.kowalski94/100
One of the few places that will quote LL-37 5 mg at all, and the synthesis came back clean on an independent check.
l.rautio94/100
Stock said available, stock was available, and it shipped the same day. That sequence is not as common as it should be.
a.wojcik94/100
The certificate for lot GGP-24-175 carried method, wavelength, water content and an itemised related-substances table. Complete on the first pass.
c.kuipers94/100
Asked them to hold an order until I confirmed a lot number and they did, without fuss and without a restocking charge.
no.zielinski94/100
Support answered on a Sunday, correctly, with the batch record attached. That is well beyond what I expected.
f.grimaldi90/100
Good communication throughout, accurate lead time, and the parcel arrived on day 2.
d.wojcik94/100
PeptideMeter has now seen 8 of their lots through me. Not one has come back outside spec.
sa.lindqvist94/100
Their warehouse in the United States had the epithalon 10 mg in stock and it shipped the same afternoon. Tracking never left the country.
l.broberg94/100
Certificate claimed 98.0% on lot GGP-26-359. Medutest came back 98.1%. On an independent column that is as close to agreement as this gets.
i.pires90/100
Documentation is complete and the numbers are steady. A dependable choice for routine work.
Block 12