Method VS-M5 · 5 criteria
How we rate shops
Four rules decide what you see, then one formula turns five criteria into a score. Here is all of it.
R1 · Order
Some shops are affiliate partners
We earn a commission when you buy from some of the listed shops through our links, and that can influence where they are placed in the ranking. Scores of all other shops are estimated from public information only. Whatever the order, you can re-sort any table by any column.
R2 · Scores
Scores are editorial estimates
Each criterion is estimated 0–10 by our editors from public information: the shop’s own website, terms, contact options and stated testing, and for smaller shops without a confirmed website their listing on PeptidesLookup. We have not placed test orders or run lab tests; when better evidence appears, the estimate changes.
R3 · Gaps
Unknown facts are shown as “not published”
If a shop doesn’t publish its payment methods, refund policy, founding year or lab reports, the spec sheet shows a dash — never a guess.
Public COAs Not published — = not published by the shop
R4 · Reviews
Reviews come only from verified emails
Every user review needs a confirmed email address and passes moderation. We don’t write, buy or import reviews; if a shop has none, it shows none.
Affiliate noteSome shops on this site are affiliate partners: we earn a commission on purchases through our links, and this can influence their placement.
overall = 0.30 × purity + 0.20 × transparency + 0.20 × price + 0.15 × shipping + 0.15 × support
- C1
Purity & testing
Stated purity, independent HPLC/MS testing, batch-level COAs.
30%weight - C2
Transparency
Identifiable operator, imprint, clear terms and contact options.
20%weight - C3
Price & value
Price level, free-shipping threshold and how generous the coupons are.
20%weight - C4
Shipping
EU coverage, speed, discreet packaging, tracking.
15%weight - C5
Support
Reachable contact channels and how problems get resolved.
15%weight
Example Nexo Research
A score, worked through
| Criterion | Score | × weight | = Points |
|---|---|---|---|
| Purity & testing | 8.6 | 0.30 | 2.580 |
| Transparency | 8.2 | 0.20 | 1.640 |
| Price & value | 8.8 | 0.20 | 1.760 |
| Shipping | 9.0 | 0.15 | 1.350 |
| Support | 8.4 | 0.15 | 1.260 |
| Overall (rounded) | 8.6 |
Bands Labels & colors
Reading a score
- Excellent9.0 – 10
- Very good8.5 – 8.9
- Good8.0 – 8.4
- Fair7.0 – 7.9
- Weak0 – 6.9
Color is always paired with the number — nothing on VialScore is communicated by color alone.
01 · Evidence
Where scores come from
Public information: product and policy pages, stated testing and purity, shipping terms, contact options and imprint. For shops listed on PeptidesLookup we also show its verification status and buyer rating, with the review count and date. Every shop page lists its sources.
02 · Coupons
Where coupons come from
Codes come from shops we have an agreement with and are listed with their terms, minimum order and expiry date. Expired codes disappear automatically. Shops without an agreement have no code here.
03 · Email
Why we verify emails
Codes that get scraped and reposted get shut down by shops. Verifying an email keeps codes working for real shoppers and keeps reviews honest — one check opens every code for 180 days. What we store.
What a score is not
- Not a lab result: we evaluate shops, not individual batches.
- Not neutral on order: affiliate partnerships can influence placement, as disclosed above.
- Not advice on use: we never give dosing or medical guidance.
Products listed by these shops are sold for laboratory research use only. Nothing on this site is medical advice.