About BYOSY
BYOSY (byosy.sk) is a Slovak DTC research-peptide e-shop run by a real, established, financially clean Slovak company (PIXEL PLUS SK s.r.o., ICO 48330019, Nitra, founded 2015), with strong identity transparency for the niche, clear research-use-only labeling, transparent at/below-market EUR pricing, and tracked EU-wide shipping. But it publishes no openable COA anywhere: testing 'by German lab PSL GmbH' at '>=98% purity' is only asserted, with no batch IDs, chromatograms, purity numbers, or certificate to verify, and the shop has essentially zero independent reputation.
Score overview
How we score →Weighted composite across 8 criteria; the letter grade follows our published bands and integrity gate.
Key facts
Pros
- Operated by a real, registered, financially clean Slovak s.r.o. (PIXEL PLUS SK, ICO 48330019, DIC/VAT SK2120135842, founded 2015, no debts or insolvency) with a verifiable physical Nitra address, full terms/returns/complaints and GDPR pages, and clear repeated research-use-only labeling – well above the anonymous-LLC / email-only EU norm
- Transparent at/around/below-market EUR pricing (BPC-157 5mg EUR30, BPC-157+TB-500 EUR70, Retatrutide EUR140), free shipping over EUR39, tracked EU-wide shipping via SPS and Packeta with next-day SK delivery and a stated reship-on-damage guarantee; names a genuine lab (PSL GmbH) rather than an invented one, and no evidence of fraud
Cons
- Publishes NO openable COA anywhere – testing by 'PSL GmbH' and '>=98% purity' are only marketing claims with no batch IDs, chromatograms, purity numbers, or downloadable certificate, and PSL does not publicly confirm any BYOSY relationship, so the entire quality case is unverifiable (coa_status none, not verified)
- Essentially zero independent reputation (no Trustpilot/Heureka/ScamAdviser profile, no Modry konik/Reddit mentions – a Slovak 'verified peptide shops' thread recommends a different vendor), the legal identity is buried on the Terms page only (homepage/About/Contact show just 'BYOSY' + email/phone), and payment is a single rail (bank transfer + cash on delivery, no card recourse or crypto)
Is BYOSY legit? Common questions
Is BYOSY a legit peptide vendor?
BYOSY scores 43.8/100 (F). Because we could not verify an independent third-party COA, its grade is capped under our integrity gate, treat purity and quality claims with caution until independent testing is provided.
Does BYOSY provide third-party lab testing?
No independent third-party COA was on file at our last review. Without external lab verification we cannot confirm what is in the vial, and the grade is capped.
Where does BYOSY ship to and how fast?
BYOSY reports shipping to Slovakia (Nitra), typically in around Next business day within Slovakia; EU-wide via SPS and Packeta (tracked, free over EUR39; EU transit time not stated).
What payment methods does BYOSY accept?
BYOSY accepts bank transfer.
When was this BYOSY review last updated?
This grade was last reviewed on 2026-07-04 under methodology v1.0.
A credible, non-scam-looking Slovak vendor with unusually good bones for the niche – a real registered VAT s.r.o. with a verifiable Nitra address, full legal/returns pages, research-use-only labeling, fair transparent EUR pricing, and tracked EU-wide SPS/Packeta shipping with a reship-on-damage guarantee. Its trust case is undermined, though, by an entirely unverifiable quality claim: it names a genuine lab (PSL – Peptide Specialty Laboratories GmbH) and claims per-batch '>=98%' testing but publishes NOT ONE openable COA, batch ID, or chromatogram, and it has no independent reputation (no Trustpilot/Heureka/forum footprint). The absent independent COA caps it at a borderline D+.
Our labelled opinion, based on the dated evidence in the score overview. See how we score.
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