CORE
In stock · Tracked shipping · COA included

MK-677 in stock now.

CORE MK-677 is tested by an independent lab, and every batch ships with its own certificate of analysis. Take a look at the product - or browse the full CORE range.

MK-677 · 60 capsules · Certificate you can verify

✓ 99%+ verified purity
✓ Batch-specific COA
✓ Rated 4.9/5

Half of this market fails the lab test.

In 2017, researchers tested 44 research products sold online. The results were published in JAMA. Only 52% contained the compound named on the label. Some had the wrong dose. Some had a different compound. Some had none at all.

You cannot see any of this from the outside. It only shows up in a lab report.

52%
of tested products contained the compound stated on their label. Source: JAMA, 2017.

Four checks before you buy from anyone.

Use this list on any store - including ours.

Here is how CORE MK-677 scores on all four.

CORE MK-677 · Supplier checkVerified per batch
Third-party testingJanoshik - independent accredited lab. HPLC and mass spectrometry.
✓
Batch-specific COAIssued for every batch. Request it before you order.
✓
Label match99%+ purity. The same figure on the label and on the certificate.
✓
ManufacturingProduced in GMP-certified facilities. ISO 7 cleanroom environment.
✓
AbsorptionPiperine (black pepper extract) in each capsule. Most sellers skip this.
✓
4.9/5 average rating from verified buyerscoresarms.com
CORE MK-677 (Ibutamoren)
60 capsules · Batch-tested · Certificate included
  • ✓ 99%+ verified purity
  • ✓ Janoshik COA with every batch
  • ✓ Piperine for absorption
  • ✓ Fast, tracked shipping

Common questions

Can I see the lab report before I order?
Yes. Ask for the certificate of analysis for any batch and the team will send it. You can check it before you spend anything.
Who does the testing?
Janoshik, an independent accredited lab. Testing uses HPLC and mass spectrometry. CORE does not grade its own homework - that would not be proof.
Is it legal to buy?
Rules differ by country. In most markets, MK-677 is not approved for human consumption. Check your local rules first.

The label is a claim.
The certificate is proof.

See the MK-677 product page and its batch certificate - or explore everything CORE stocks.