Buy MK-677 — Peptide Sciences Alternative QSC has MK-677 in stock — ≥99% HPLC · Janoshik COA · US Domestic 2–4 Days
Former Peptide Sciences customers: QSC ships MK-677 from a US domestic warehouse in 2–4 business days with Janoshik independent COA verification — a superior standard to Peptide Sciences’ in-house COA. In stock now.
Peptide Sciences has permanently closed. QSC stocks MK-677 at ≥99% HPLC purity with Janoshik independent COA — verified by an external laboratory, publicly checkable at verify.janoshik.com. US domestic warehouse, same shipping speed you were used to with PS.
Why QSC for MK-677?
Why the COA difference matters
Peptide Sciences — In-House COA
Certificate issued by Peptide Sciences themselves
No public verification link — you trust the seller
Result can be updated or removed by the seller
No independent laboratory relationship
QSC — Janoshik Independent COA
Certificate issued by Janoshik — no commercial relationship with QSC
Result published at verify.janoshik.com — publicly verifiable by anyone
Once published, the result cannot be altered by QSC
Unique batch code included with every order
MK-677 at QSC — Specifications
Compound
MK-677
Mechanism
Oral GHS-R1a · GH/IGF-1 axis
Category
GH Peptides
Purity
≥99% HPLC · MS confirmed · every batch
COA
Janoshik independent · verify.janoshik.com
US Shipping
US Domestic Warehouse · 2–4 business days
Form
Lyophilised powder · research grade
Frequently Asked Questions
Where can I buy MK-677 now that Peptide Sciences has closed?
QSC (qscpeptide.com) stocks research-grade MK-677 at ≥99% HPLC purity with Janoshik independent COA — available now, shipped from US domestic warehouse in 2–4 business days. MK-677 is a core compound in QSC’s catalog. Every batch is verified by MS molecular confirmation in addition to HPLC.
Is QSC a good replacement for Peptide Sciences MK-677?
Yes — QSC’s MK-677 is verified at ≥99% HPLC purity with a Janoshik independent COA, which is a superior verification standard to Peptide Sciences’ in-house COA. Janoshik COAs are issued by an external laboratory (verify.janoshik.com), publicly verifiable using the batch code included with every order, and cannot be altered post-publication by QSC.
How does QSC MK-677 compare to Peptide Sciences MK-677?
Both QSC and Peptide Sciences marketed ≥99% HPLC purity for MK-677. The key difference is verification: Peptide Sciences used an in-house COA (self-issued, not independently verifiable). QSC uses a Janoshik independent COA — any researcher can verify the published result at verify.janoshik.com using the unique batch code. QSC also ships from a US domestic warehouse (2–4 business days) and stocks next-generation compounds Peptide Sciences never carried.
What is the mechanism of MK-677?
MK-677 (Oral GHS-R1a · GH/IGF-1 axis). QSC maintains a dedicated research hub at qscpeptide.com/mk-677-research/ covering mechanism of action, clinical data, storage protocols, and comparative analyses. All QSC MK-677 is sold for in vitro laboratory research only.
