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Chinese direct vendor

QSC (Qingdao Sigma Chemical)

Chinese direct manufacturer with the lowest prices, massive product range, and domestic warehouses in 4+ countries.

Last updated

Scored 5.7 5.7 of 10 overall, across 8 dimensions how scores are derived

Score breakdown

Dimension scores are editorial, carried from the operator's earlier directory — they are not user reviews. Each label links to what the dimension measures.

About QSC (Qingdao Sigma Chemical)

Chinese direct manufacturer and the largest peptide supplier discussed in bodybuilding and research forums. Operates domestic warehouses in the US, EU, Canada, and Australia for faster delivery. Known for extremely competitive pricing but controversial community presence including forum bans and doxxing incidents.

Written for the operator's previous directory and reproduced unchanged (markup and emoji stripped); the rest of this site does not share its voice. Ported observed .

From the storefront

No public product feed on file. The storefront exposes no product API we can read without an account, so nothing is shown rather than something guessed.

Catalogue, as their API returns it

Their API answered but returned no products. observed

Strengths and weaknesses

Where it does well

  • Lowest prices in the market
  • Massive product range

Where it falls short

None recorded.

Carried verbatim from the source directory's editorial review, observed .

Shipping

Destinations
  • United States
  • European Union
  • Canada
  • Australia
  • Worldwide
Countries Served
United States, European Union, Canada, Australia, Worldwide observed
Domestic Shipping
Varies by method observed
Estimated Delivery
Domestic: 4-5 business days (from US warehouse) | International: 2-4 weeks (direct from China) observed
Free shipping
No
Reship guarantee
Not on file
Refund policy
Not on file

Payments

  • crypto
  • bitcoin
  • wire-transfer

Coupons

No current code on file. Codes are published only with the code, the discount, a source and the date we saw it, and expired codes are removed at build — the coupon policy. 0 are on file site-wide today.

Certificates of analysis

Third-party tested
Yes
Publicly accessible
No
Test types
  • HPLC
  • Mass Spectrometry
Source's COA tier
third-party

Some Janoshik third-party testing available. Concerns about cherry-picking favorable test results. Not all products have COAs. observed

A COA describes one batch's purity. It is a document about a vial, not evidence about an effect, and it never grades a claim on this site — the grading rubric names what qualifies.

Peptides listed 32

Linked names have a record here; the others we hold nothing on yet. A vendor listing a compound says nothing about the evidence for it.

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