Jun 4, 2025 at 10:54 AM#6
This is exactly the kind of data-driven post I love seeing here. Just ordered my first batch of QSC tirz based on posts like this.
Quick question — did you notice the 10mg dose working notably better than 7.5mg? I've read some people plateau and the jump from 7.5→10 doesn't do much. Trying to decide if I should stay at 7.5 longer before increasing.
41 11ingrid_STO, pete_nash, hank_denver and 38 others
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Jun 4, 2025 at 11:48 AM#7
Honestly the jump from 7.5 to 10 was subtle for me. The biggest leap in effectiveness was 2.5→5mg. After that the curve flattens. I moved to 10mg because my weight loss had slowed (only 2 lbs in weeks 11-12) and I wanted to push through.
If you're still losing consistently at 7.5, there's no rush to increase. Higher doses = more potential side effects and you burn through your supply faster. I'd say stay at 7.5 until you hit a clear 2-week plateau.
Last edited: Jun 4, 2025 at 5:48 PM
40 10InsuranceTom, WendyG_ATL, SaraMom3 and 37 others
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Jun 4, 2025 at 12:42 PM#8
Adding to the community data pool — I tested QSC tirz from Batch #TZ-2025-1204 (December order) at Janoshik:
- Purity: 97.4%
- Identity: Confirmed
Slightly lower than carlos_SATX's but still well above spec. Interesting to see the batch-to-batch variance. I've compiled 34 QSC tirz Janoshik results now:
| Range | Count | % |
|-------|-------|---|
| 98-100% | 12 | 35% |
| 96-97.9% | 18 | 53% |
| 94-95.9% | 3 | 9% |
| <94% | 1 | 3% |
Mean purity: 97.3%. That one sub-94% result (93.1%) was from an early 2025 batch and may have been a storage issue on the buyer's end. Pretty impressive consistency overall. 📈
39 9LindaRN_retired, tommy_boulder, hyun_seoul and 36 others
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Janoshik Analytical — Independent Testing
Trusted third-party HPLC & mass spectrometry analysis. Verify peptide purity with the lab the community relies on. Independent. Accurate. Transparent.
Verify Your PeptidesGL Biochem (Shanghai) Ltd. — Direct Manufacturer
Est. 1998. The synthesis house behind the vials you send for testing. ISO 9001 and cGMP certified, 1,500+ staff, batch-specific COA with every order.
Browse GL BiochemJun 4, 2025 at 1:36 PM#9
that table is gold. A mean of 97.3% across 34 independent consumer tests is remarkable for a gray-market peptide supplier. For comparison, some compounding pharmacies have had FDA citations for products testing below 90%.
Thanks everyone for the great discussion. This is why community-driven testing matters — no single test tells the full story, but 34 data points paints a very clear picture. QSC tirz is the real deal. 🔬
38 8SaraMom3, Dr.MetabolicMD, RetaRick_CA and 35 others
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