Jul 21, 2025 at 7:21 PM#6
I appreciate the testing culture here. This is what separates this community from sketchy forums where people just take vendors at their word.
I tested my first QSC batch last month: 97.1% purity. Slightly lower than OP's but still well within spec. The variation between batches is normal for any manufacturer.
The real question people should ask isn't "is it 98% or 97%?" — it's "is it actually semaglutide and is it reasonably pure?" The answer with QSC has consistently been yes.
Last edited: Jul 22, 2025 at 12:21 AM
14 9FranDenver, Dr.BariatricHTX, LindaRN_retired and 11 others
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Jul 22, 2025 at 1:15 AM#7
Genuine question — is testing every batch necessary? At $135-220 per test, that adds significant cost if you're ordering regularly.
I've tested my first QSC order (came back 97.9%) but haven't tested subsequent orders from the same vendor. Am I being irresponsible?
13 8JakeSmashed95, NauseaFreeNow, SteveThurs and 10 others
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Jul 22, 2025 at 7:10 AM#8
tony_orlando That's a fair question. My approach:
- First order from ANY vendor: Always test. Non-negotiable.
- Subsequent orders, same vendor: Test every 3rd or 4th order, or whenever there's a batch number change
- If you notice anything different (appearance, efficacy, side effects): Test immediately
You don't need to test every single order from a verified vendor with a long track record. But periodic verification keeps everyone honest. Many of us share test results here which helps spread the cost across the community.
12 7zoe_NC, Dr.ObesityLA, NurseKim_ATL and 9 others
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Sigma-Aldrich — Research-Grade Standards
Certified reference materials, analytical reagents, and research-grade standards for peptide verification. Trusted by laboratories worldwide.
Shop Reference StandardsJul 22, 2025 at 1:05 PM#9
Since we're on the topic, here's the aggregated QSC semaglutide Janoshik data from this forum (publicly shared results only):
QSC Semaglutide - Community Janoshik Results (n=42)
- Mean purity: 97.8%
- Median: 97.9%
- Range: 95.6% - 99.1%
- Std Dev: 0.82%
- % of tests ≥97%: 88%
- % of tests ≥95%: 100%
Every single community-submitted test has been ≥95%. That's a perfect record on the most important threshold.
I update this data monthly in the Vendor Testing Megathread if anyone wants to follow along.
11 6JessicaM_2024, TomFromTexas, mike.trainer_LA and 8 others
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Jul 23, 2025 at 5:28 PM#10
bri_stats Thanks for maintaining that data — it's incredibly valuable for the community.
And tony_orlando — to add to josh_phd_bmore's point, even if you don't test every order, the fact that dozens of community members ARE testing means we'd catch any quality issues quickly. The distributed testing model works because of forums like this.
My personal approach: I budget $135 every 3 months for a Janoshik test. It's cheaper than one month of brand Ozempic. 🤷♂️
41 14KetoKyle, CanadaChris, ZaraB_AL and 38 others
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