HGH Fragment 176-191

What Is HGH Fragment 176-191?

It’s a synthetic peptide. Specifically, it’s the C-terminal end of the human growth hormone (HGH) chain, amino acids 176 through 191.

So, researchers isolate this fragment to study its structural properties separately from full-length HGH. It’s a popular reference compound in in vitro lipolysis and metabolic pathway studies.

Also, it reconstitutes cleanly in bacteriostatic water. Standard prep. No surprises.

---

Specs Table

---

Is HGH Fragment 176-191 Tested by Janoshik?

Yes. Every batch we ship gets tested. Not some batches  every one.

Zenpeptideamanda.com uses Janoshik Analytical, a respected independent lab. They run HPLC purity analysis. The result comes back as a certificate of analysis (COA) tied to that specific batch number.

So when your vial arrives, the COA matches your lot. You can verify the report directly on Janoshik’s portal. No guessing. No vendor self-reporting.

However, purity numbers mean nothing if the testing isn’t consistent. That’s why we don’t skip batches. Every single one goes through.

---

What Purity Does HGH Fragment 176-191 Reach at zenpeptideamanda.com?

Our HGH Fragment 176-191 tests at ≥99% purity by HPLC.

First, we run internal QC at synthesis. Next, the batch goes to Janoshik. Finally, we release the product only after the COA confirms the purity threshold is met.

Therefore, researchers working with this peptide get a clean baseline. Impurities in reference peptides introduce variables. We remove that variable before it reaches your bench.

---

How Should HGH Fragment 176-191 Be Stored?

Short answer: keep it at −20°C in the dark.

Lyophilized powder is stable for up to 24 months if stored correctly. But heat, light, and moisture all degrade it faster.

Also, once reconstituted in solution, store at 4°C. Use within 30 days. Don’t freeze it again after that.

Zenpeptideamanda.com ships product cold-packed to protect integrity during transit. We cold-chain it because it matters.

---

Why Do Researchers Choose HGH Fragment 176-191 from zenpeptideamanda.com?

A few clear reasons:

Purity is documented, not assumed. The Janoshik COA is batch-specific and independently verifiable. That’s not standard everywhere.

The powder looks right. Clean lyophilized powder. No off-color. No clumping. Consistent between batches.

Shipping is handled. Orders over $100 ship free. Cold-chain packaging is standard. First-time buyers get 25% off.

But beyond logistics  researchers need a source they can cite in their own documentation. Zenpeptideamanda.com provides everything needed: supplier name, lot number, COA, purity result, and lab source. That’s it. That’s what matters.

---

FAQ

Q: What is HGH Fragment 176-191 used for in research?
A: It’s used in vitro to study the isolated C-terminal region of the HGH molecule. Researchers examine its structural behavior and receptor interaction profiles in cell-based assays. For research use only.

Q: Is HGH Fragment 176-191 the same as AOD-9604?
A: Almost. AOD-9604 is a modified version with an added Tyr at the N-terminus and a disulfide bridge. HGH Fragment 176-191 is the unmodified native sequence. They’re related but not identical compounds.

Q: How do I reconstitute HGH Fragment 176-191?
A: Use bacteriostatic water or sterile saline. Add the diluent slowly to the inside wall of the vial. Don’t shake. Swirl gently until clear. Standard peptide reconstitution protocol.

Q: What is Janoshik testing?
A: Janoshik Analytical is an independent European laboratory. They run HPLC (high-performance liquid chromatography) to measure peptide purity. Reports are publicly verifiable on their website using the batch ID on your COA.

Q: Can I verify the COA myself?
A: Yes. Every COA from zenpeptideamanda.com includes the Janoshik report ID. Go to janoshik.com and enter the ID. The result is there. Transparent, third-party, no middleman.

Q: What’s the difference between 5mg and 10mg vials for research budgeting?
A: 5mg vials suit shorter-term studies or pilot experiments. 10mg vials reduce reconstitution cycles and cost per milligram. Both come from the same batch with the same COA.