l.rahimi97/100
Stability statement written against a named storage condition rather than an abstract interval. Complete against the index minimum data set at first issue.
SIG — Sigma-Aldrich (Shanghai) Trading Co., Ltd.
Shanghai, CN · established 2005. The index holds 160 assay reports across 30 batches and 20 compounds, contributed by 6 laboratories. Every figure below is computed from those records and from nothing else.
Where SIG sells
Sigma-Aldrich (Shanghai) Trading 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.
Visit SIG at sigmaaldrich.org →
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
- Sigma-Aldrich (Shanghai) Trading Co., Ltd.
- Short code in this index
- SIG
- Also known as
- SIG · Sigma-Aldrich · Sigma Aldrich Shanghai · 西格玛奥德里奇（上海）贸易有限公司
- Domain
- sigmaaldrich.org →
- City
- Shanghai
- Region
- Shanghai
- Country
- CN
- Established
- 2005
- First record in index
- 01 Feb 2024
- Most recent record
- 15 Oct 2026
Block 1b
Dispatch and regional stock
Counted from the chain-of-custody line on this supplier's own records, which names the route each vial travelled to the laboratory, and from the on-record reviews below. The index has no sight of any supplier's warehouse network and publishes none.
Domestic-warehouse route
15.6%
n=160
Retail, shipped to the buyer
76.9%
n=160
Direct to the laboratory
3.1%
n=160
Median courier leg, direct despatch
8d
n=5
| Route to the laboratory | Records | Share |
|---|---|---|
| Domestic warehouse despatch | 25 | 15.6% |
| Retail purchase, shipped to the buyer | 94 | 58.8% |
| Retail purchase via a third-party forwarder | 29 | 18.1% |
| Supplier despatch direct to the laboratory | 5 | 3.1% |
| Laboratory retained-sample archive | 7 | 4.4% |
Every record here carries a chain-of-custody line and that line names the route the vial travelled. Of the 160 SIG records the index holds, 25 reached the contributing laboratory from a domestic warehouse rather than as a cross-border consignment, covering 11 of the 20 compounds SIG is represented by here — Tirzepatide, Epitalon, GHRP-2, Cagrilintide, Semaglutide, Ipamorelin and 5 further compounds. Those are the SIG lines this index has actually seen arrive from regional stock, and they are a count of consignments rather than a stock listing: a line missing from them may simply never have been submitted for assay.
One contributor on the record below documents SIG stock held in Netherlands, with a transit of 6 working days against a quoted 6. Netherlands is the only regional stock location named anywhere in SIG's record here, and one consignment described by one buyer is exactly that. It is not a warehouse list and the index has not verified it.
The index measures nothing about lead time — it assays material, it does not buy it. What it has is SIG's own reviewers: 2 of the 24 on-record reviews state a quoted window and what happened against it. Where SIG despatched a sample direct to a laboratory, the courier leg ran a median 8 days across 5 such consignments — that is a transit time the index can see, and it is not the same thing as a lead time. The reviews are reproduced in full in Block 11.
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
98.57%
n=160
Interquartile range
0.86pp
n=160
10th percentile
97.66%
n=160
Pass rate vs index spec
85.0%
n=160
Median recovery vs claim
98.6%
n=87
Median water
4.97%
n=160
Median |mass error|
2.5ppm
n=143
Records carrying a flag
21.3%
n=160
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
0.82pp
n=18
Index median spread
0.67pp
n=28
Lots tested 3+ times
18
n=30
Across the 18 SIG lots in the index with three or more independent assays, the median spread between the highest and lowest purity result on one lot is 0.82 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
+0.22pp
n=30
Index median divergence
+0.06pp
n=28
Divergences in the supplier's favour
77%
n=30
Divergences beyond 1 pp
0%
n=30
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
98.56%
n=148
Supplier-supplied median
98.78%
n=5
Supplier-supplied share of records
3.1%
n=160
Block 6
Documentation completeness
The score is not an opinion about paperwork. Each component is the share of SIG batches in the index whose certificate carries that field, weighted as set out on the scoring rubric.
Documentation score
91/100
n=30
Index median score
85/100
n=28
| Certificate field | Batches carrying it | Rubric weight | |
|---|---|---|---|
| Purity figure stated | 100% | 25 points | |
| Analytical method stated (column, gradient, wavelength) | 80% | 25 points | |
| Peptide content stated | 47% | 20 points | |
| Endotoxin stated | 27% | 15 points | |
| Named impurities rather than a total | 69% | 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 % |
|---|---|---|---|---|---|---|---|
| Tirzepatide | Incretin | 30 | 98.00 | 98.55 | -0.55 | 97.0 | 100 |
| Epitalon | Short | 20 | 98.97 | 99.56 | -0.59 | 99.0 | 45 |
| Cagrilintide | Incretin | 14 | 98.27 | 98.69 | -0.42 | 96.5 | 100 |
| GHRP-2 | Growth-hormone | 13 | 99.11 | 99.28 | -0.17 | 99.0 | 69 |
| PEG-MGF | Growth-hormone | 13 | 97.75 | 97.75 | 0.00 | 92.0 | 100 |
| Semaglutide | Incretin | 9 | 98.50 | 98.89 | -0.39 | 97.0 | 100 |
| Retatrutide | Incretin | 9 | 97.97 | 98.37 | -0.40 | 96.5 | 89 |
| MK-677 (Ibutamoren mesylate) | Non-peptide | 9 | 98.83 | 99.49 | -0.66 | 98.5 | 89 |
| SS-31 (Elamipretide) | Metabolic | 8 | 99.31 | 99.53 | -0.22 | 98.5 | 100 |
| Semax | Neuroactive | 7 n=7 | 99.08 | 99.46 | -0.38 | 98.5 | 86 |
| Liraglutide | Incretin | 7 n=7 | 98.48 | 99.00 | -0.52 | 97.5 | 100 |
| Ipamorelin | Growth-hormone | 6 n=6 | 98.97 | 99.47 | -0.50 | 99.0 | 33 |
| GHK-Cu | Tissue-repair | 3 n=3 | 98.28 | 98.56 | -0.28 | 97.0 | 100 |
| Adipotide | Metabolic | 2 n=2 | n<3 | 98.58 | — | 96.0 | 100 |
| Vilon | Short | 2 n=2 | n<3 | 99.65 | — | 99.0 | 0 |
| Selank | Neuroactive | 2 n=2 | n<3 | 99.59 | — | 99.0 | 100 |
| MOTS-c | Metabolic | 2 n=2 | n<3 | 99.13 | — | 98.0 | 100 |
| BPC-157 | Tissue-repair | 2 n=2 | n<3 | 99.16 | — | 98.0 | 100 |
| Melanotan II | Melanocortin-receptor | 1 n=1 | n<3 | 99.42 | — | 98.5 | 100 |
| L-Glutathione (reduced) | Short | 1 n=1 | n<3 | 99.33 | — | 98.5 | 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 | 2 | 7 | 98.71 | 98.04–99.20 | 2 |
| 2024-Q2 | 2 | 3 | 98.73 | 98.40–98.79 | 0 |
| 2024-Q3 | 2 | 20 | 97.74 | 97.49–99.09 | 1 |
| 2024-Q4 | 0 | 0 | n<3 | — | 0 |
| 2025-Q1 | 3 | 16 | 98.98 | 97.33–99.71 | 4 |
| 2025-Q2 | 2 | 7 | 98.66 | 97.84–98.93 | 0 |
| 2025-Q3 | 3 | 7 | 98.37 | 96.29–98.78 | 1 |
| 2025-Q4 | 4 | 10 | 98.87 | 96.94–99.39 | 1 |
| 2026-Q1 | 4 | 25 | 98.71 | 97.66–99.93 | 4 |
| 2026-Q2 | 7 | 52 | 98.25 | 97.28–99.78 | 16 |
| 2026-Q3 | 1 | 13 | 99.11 | 98.51–99.57 | 5 |
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 | 71 | 98.53 | +0.00 | 98.53 |
| PeptideMeter | 34 | 98.69 | -0.05 | 98.74 |
| Medutest | 14 | 98.84 | +0.08 | 98.77 |
| VendorInvestigate | 17 | 98.24 | -0.11 | 98.35 |
| Nordanalyt | 11 | 98.38 | +0.02 | 98.36 |
| Kestrel | 13 | 98.54 | +0.24 | 98.30 |
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 24
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.
95.0/ 100691 ratings across the index network
g.beaulieu99/100
Lot SIG-2607-0338 submitted to Janoshik, origin withheld. Declared 98.0%, reported 98.5%. Janoshik report held on file, figures match published.
c.molnar96/100
Related-substances table itemised by impurity with assigned retention times. Not aggregated. Submitted to the index in full.
fa.sjoberg88/100
Counter-ion identity not declared on the certificate. Per-milligram figure cannot be calculated against declared peptide content. Scored down on that criterion alone.
an.nascimento99/100
Supplementary chromatogram for a lot released 11 months earlier retrieved from supplier records within 2 working days. Record covers the lot named.
fr.chukwu97/100
Gradient, column chemistry and detection wavelength stated. Separation reproducible from the document as issued.
p.brandt90/100
Identity by ESI-MS against a stated expected mass. No sequence confirmation offered on request. Evidence base adequate for a rating on this criterion.
z.aalto98/100
Cross-check: Medutest and PeptideMeter, same lot, agreement to 0.3 points. Both agree with the declared figure. Figures as reported by the named services.
k.petrov92/100
Water content released on request, same working day, Karl Fischer determination named. Not carried on the certificate as issued. Scored as available rather than present.
a.salgado96/100
Identifier matches across vial, certificate and commercial documentation on 4 consecutive consignments. No further comment.
i.ndiaye98/100
Dispatch revision notified ahead of the quoted date. Revised date held. Despatch note timed.
r.nilsen95/100
11 certificates, 14 months, identical layout. Lot-to-lot comparison possible without transcription. Submitted to the index in full.
an.pereira99/100
Reference standard named on request. Determination traceable rather than internally consistent only.
r.lokken96/100
Transit 6 days from stock held in Netherlands against a quoted 6. Shipment temperature record enclosed with the consignment.
m.rahimi94/100
Catalogue minimum one unit. Independent verification obtainable at the cost of a single vial. Independent verification of individual lots still required.
a.lundgren97/100
Cagrilintide 5 mg. Declared 98.0%, reported 98.2%. Delta inside method repeatability. Figures as reported by the named service.
s.adeyemi95/100
Line reported unavailable rather than substituted after payment. Catalogue availability matched the published status.
l.norgaard99/100
Series: 8 determinations, 4 services, 2 years. Declared figure at or below reported on every record. Band 0.8 points wide.
l.pereira96/100
Lot-to-lot difference answered by reference to the purification step. Documentation complete at first issue.
f.ramos93/100
Registered as a trading entity. Records held here describe fill, labelling, storage and documentation only. Declared as such.
a.karlsen96/100
Reconstitution across 3 lyophilised presentations: clear on contact, no haze, no particulate. Not medical advice.
an.lindqvist94/100
Cake whole at arrival, no excipient present. Desiccant enclosed within the secondary container. Research use. Not for human administration.
n.trevino97/100
Repeat determination at 10 months: 98.2%. Original: 98.1%. No drift detected in this sample. n=1, declared as n=1.
a.chowdhury95/100
Declared figure not adjusted upward between certificate and commercial documentation. Release signed and dated, named individual.
Block 12
Most recent records
Block 13
Contributor annotations on SIG records 258
Annotations are this index's only discussion surface: signed technical comments attached to a specific record by a named contributor. They are not moderated for agreement with the index's own arithmetic. The most recent on SIG material are below, each linked to the record it sits on.
Stated storage conditions on the certificate against the observed transit conditions in the custody block: on this record they agree, which removes one class of explanation for anything unexpected.
The isotope pattern is consistent with the elemental composition of GHRP-2. That is a second, independent check on identity and it agrees with the mass.
Custody from checkout to injection is documented on this record. Provenance plus custody is what makes a single result generalise past the vial it came from.
Where two compounds elute within a third of a minute, a mass at this accuracy is what separates them. Retention alone would not have.
An intermolecular disulfide dimer elutes late and reduces cleanly. If the named table shows one, a non-reducing versus reducing comparison converts an unexplained impurity into an explained one.
Lots get submitted for two reasons: somebody submits everything, or somebody was surprised. The second reason over-represents results in this band across the whole index, and the aggregate caveat exists for it.
Retail certificates in this index carry a retest date more often than they used to. It is the field that turns a release figure into a statement about the material over time.
On compounds with a single supplier, independently purchased records are the only thing preventing the evidence base from being entirely supplier-generated. They matter disproportionately there.
Every annotation the index holds on SIG material sits on its own record; the full set is reachable from the record listing and from each contributor's page. To read them against what SIG itself publishes, open sigmaaldrich.org → alongside.
Block 14
Where to buy SIG
Sigma-Aldrich (Shanghai) Trading Co., Ltd. sells direct from sigmaaldrich.org. Everything on this page describes lots the index has already seen; the certificate that matters is the one that arrives with the vial you order, and the lot code on it should match the vial. Ask for the lot-specific document rather than the batch-level summary, and ask for the integration report if you intend to reconcile the figure yourself.
Go to the SIG store at sigmaaldrich.org →
Marked nofollow and sponsored. The index is paid nothing for it, takes no commission, and a link is not an assessment. Research compounds. Not medical advice. Nothing on this site is a safety assessment and nothing on it is approved for human use.