k.fontaine96/100
They report purity by RP-HPLC with the wavelength stated and peptide content separately. Two different numbers, correctly separated.
WXT — WuXi TIDES (WuXi AppTec Testing Division)
Wuxi, CN · established 2002. The index holds 353 assay reports across 67 batches and 28 compounds, contributed by 6 laboratories. Every figure below is computed from those records and from nothing else.
Where WXT sells
WuXi TIDES (WuXi AppTec Testing Division) 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
- WuXi TIDES (WuXi AppTec Testing Division)
- Short code in this index
- WXT
- Also known as
- WXT · WXT Biotech · WuXi TIDES (WuXi AppTec Testing Division)
- Domain
- wuxitides.net →
- City
- Wuxi
- Region
- Wuxi
- Country
- CN
- Established
- 2002
- First record in index
- 09 Feb 2024
- Most recent record
- 28 Sep 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
98.24%
n=353
Interquartile range
1.07pp
n=353
10th percentile
97.17%
n=353
Pass rate vs index spec
67.1%
n=353
Median recovery vs claim
97.9%
n=215
Median water
4.51%
n=353
Median |mass error|
2.6ppm
n=303
Records carrying a flag
88.1%
n=353
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
1.11pp
n=43
Index median spread
0.95pp
n=20
Lots tested 3+ times
43
n=67
Across the 43 WXT lots in the index with three or more independent assays, the median spread between the highest and lowest purity result on one lot is 1.11 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
+0.36pp
n=67
Index median divergence
+0.31pp
n=20
Divergences in the supplier's favour
87%
n=67
Divergences beyond 1 pp
3%
n=67
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
97.94%
n=90
Supplier-supplied median
98.38%
n=241
Supplier-supplied share of records
68.3%
n=353
Block 6
Documentation completeness
The score is not an opinion about paperwork. Each component is the share of WXT batches in the index whose certificate carries that field, weighted as set out on the scoring rubric.
Documentation score
69/100
n=67
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) | 57% | 25 points | |
| Peptide content stated | 43% | 20 points | |
| Endotoxin stated | 31% | 15 points | |
| Named impurities rather than a total | 23% | 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 % |
|---|---|---|---|---|---|---|---|
| BPC-157 | Tissue-repair | 72 | 98.37 | 99.15 | -0.78 | 98.0 | 78 |
| Semaglutide | Incretin | 52 | 98.02 | 98.87 | -0.85 | 97.0 | 94 |
| TB-500 | Tissue-repair | 26 | 98.03 | 99.47 | -1.44 | 98.5 | 15 |
| Tirzepatide | Incretin | 21 | 98.19 | 98.44 | -0.25 | 97.0 | 90 |
| Sermorelin | Growth-hormone | 14 | 98.28 | 98.94 | -0.66 | 98.0 | 79 |
| IGF-1 LR3 | Growth-hormone | 13 | 96.93 | 97.75 | -0.82 | 95.0 | 100 |
| Semax | Neuroactive | 13 | 98.50 | 99.17 | -0.67 | 98.5 | 62 |
| GHRP-6 | Growth-hormone | 12 | 98.88 | 99.65 | -0.77 | 99.0 | 33 |
| PT-141 (Bremelanotide) | Melanocortin-receptor | 11 | 98.90 | 99.31 | -0.41 | 98.5 | 64 |
| Leuprolide | Hypothalamic | 10 | 98.34 | 99.01 | -0.67 | 98.5 | 10 |
| 5-Amino-1MQ | Non-peptide | 10 | 98.50 | 99.24 | -0.73 | 98.0 | 80 |
| Selank | Neuroactive | 10 | 99.01 | 99.13 | -0.13 | 99.0 | 50 |
| Tesamorelin | Growth-hormone | 9 | 96.66 | 98.43 | -1.77 | 97.0 | 44 |
| Retatrutide | Incretin | 9 | 97.35 | 98.41 | -1.06 | 96.5 | 100 |
| Liraglutide | Incretin | 9 | 96.78 | 99.02 | -2.23 | 97.5 | 0 |
| Ipamorelin | Growth-hormone | 8 | 98.00 | 99.48 | -1.48 | 99.0 | 13 |
| GHRP-2 | Growth-hormone | 7 n=7 | 98.78 | 99.22 | -0.44 | 99.0 | 14 |
| ARA-290 | Tissue-repair | 7 n=7 | 99.18 | 99.45 | -0.27 | 98.0 | 100 |
| Melanotan II | Melanocortin-receptor | 6 n=6 | 99.09 | 99.24 | -0.15 | 98.5 | 100 |
| CJC-1295 (no DAC) | Growth-hormone | 6 n=6 | 98.14 | 98.61 | -0.47 | 98.0 | 83 |
| Survodutide | Incretin | 6 n=6 | 98.02 | 98.69 | -0.67 | 96.5 | 100 |
| N-Acetyl Semax Amide | Neuroactive | 5 n=5 | 98.18 | 99.26 | -1.08 | 98.5 | 40 |
| MK-677 (Ibutamoren mesylate) | Non-peptide | 5 n=5 | 99.43 | 99.37 | +0.06 | 98.5 | 100 |
| MOTS-c | Metabolic | 4 n=4 | 98.08 | 99.18 | -1.11 | 98.0 | 50 |
| CJC-1295 with DAC | Growth-hormone | 4 n=4 | 97.53 | 98.79 | -1.26 | 97.5 | 50 |
| L-Glutathione (reduced) | Short | 2 n=2 | n<3 | 99.00 | — | 98.5 | 0 |
| Pramlintide | Incretin | 1 n=1 | n<3 | 98.84 | — | 97.5 | 100 |
| Enclomiphene citrate | Non-peptide | 1 n=1 | n<3 | 99.23 | — | 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 | 4 | 97.48 | 96.93–98.29 | 4 |
| 2024-Q2 | 1 | 13 | 98.50 | 98.09–99.17 | 4 |
| 2024-Q3 | 3 | 19 | 98.79 | 98.27–99.93 | 9 |
| 2024-Q4 | 6 | 24 | 98.27 | 96.84–99.48 | 24 |
| 2025-Q1 | 8 | 34 | 98.72 | 96.67–99.93 | 33 |
| 2025-Q2 | 5 | 39 | 98.49 | 97.37–99.74 | 39 |
| 2025-Q3 | 11 | 57 | 98.00 | 96.45–99.73 | 48 |
| 2025-Q4 | 8 | 59 | 97.96 | 96.97–99.76 | 59 |
| 2026-Q1 | 9 | 53 | 98.18 | 95.95–99.93 | 50 |
| 2026-Q2 | 9 | 32 | 98.13 | 97.11–99.20 | 31 |
| 2026-Q3 | 5 | 19 | 98.11 | 96.37–99.22 | 10 |
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 | 162 | 98.23 | +0.00 | 98.23 |
| PeptideMeter | 57 | 98.13 | -0.05 | 98.18 |
| Medutest | 51 | 98.29 | +0.08 | 98.21 |
| VendorInvestigate | 33 | 97.94 | -0.11 | 98.05 |
| Nordanalyt | 21 | 98.58 | +0.02 | 98.56 |
| Kestrel | 29 | 99.03 | +0.24 | 98.79 |
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.
95.0/ 1001,002 ratings across the index network
b.danquah92/100
Documentation is complete and the numbers are steady. A dependable choice for routine work.
d.restrepo96/100
Stock said available, stock was available, and it shipped the same day. That sequence is not as common as it should be.
m.villalobos96/100
9 orders in eighteen months, no substitutions, no reformulations, everything in stock when the site said it was. Boring is the highest compliment I have.
c.sobczak96/100
Arrived on day 2 against a quoted 3. Customs paperwork was right first time, which is why it moved that fast.
k.guerrero96/100
Custom synthesis quote came back with a realistic timeline and they beat it. Purity on delivery matched the signed spec.
t.moreau96/100
The certificate for lot WXT-25-502 carried method, wavelength, water content and an itemised related-substances table. Complete on the first pass.
m.kimani92/100
Straightforward order, arrived as described, documentation adequate and complete. Nothing to add, which is the point.
la.haddad96/100
Three compounds on one invoice, all three lot-matched to their own certificates, all three inside spec on independent testing.
ch.dahlberg96/100
Pleased to find they hold stock in Canada. Domestic dispatch, day 4, no customs step at all.
m.hartmann96/100
One of the few places that will quote glutathione 600 mg at all, and the synthesis came back clean on an independent check.
jo.lindholm92/100
Consistent rather than flashy. Everything lands in the high nineties, and it lands there every time.
k.chowdhury92/100
Solid on the BPC-157 10 mg. Purity where it should be, transit 2 days, paperwork in order.
r.wojcik92/100
Fair pricing for the documentation standard, and delivery landed on day 4 as quoted.
a.chowdhury96/100
Sixth order from them, all BPC-157 5 mg. Sent one vial from each to PeptideMeter and the whole set landed inside half a point of each other. That flatness is exactly what I pay for.
a.palacios96/100
Dispatched from their warehouse in Canada rather than from the factory, so the glutathione 600 mg was with me on day 3.
s.kjaer96/100
Asked them to hold an order until I confirmed a lot number and they did, without fuss and without a restocking charge.
fe.novak96/100
Vials wrapped individually, foam cut to fit, nothing loose in the box. Packing that has clearly been thought about.
b.salinas96/100
Regional stock makes the difference — dispatched within the United States, day 3, cold pack still hard on arrival.
j.ekstrom92/100
Third order and it went the same way as the first two. Predictable in the way you want a supplier to be.
i.vogel96/100
Moved here after two bad lots elsewhere. 4 orders in and the Medutest numbers have been flat every single time.
bi.restrepo92/100
Reliable on the general catalogue lines. Purity figures cluster tightly and the certificates match the lots.
v.rasmussen96/100
Their warehouse in the United States carries the lines I reorder, so there is no wait on a factory run. Day 3 every time.
el.mwangi96/100
Their warehouse in Canada had the MOTS-c 10 mg in stock and it shipped the same afternoon. Tracking never left the country.
n.molnar96/100
No customs paperwork, no import wait — it came from their stock in the United Kingdom and arrived day 3.
s.erdogan92/100
Steady supplier. Janoshik results have agreed with their stated figures on every lot I have submitted.
Block 12