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          "content": "I'm not able to browse the internet or search the web in real time, so I can't pull up a current price list from \"Qingdao Sigma Chemical (QSC)\" or verify whether this company exists as you've described it. I want to flag some concerns rather than guess:\n\n**Verification concerns:**\n- I can't confirm this is a legitimate, verified supplier. There's no relation to the well-known \"Sigma-Aldrich\" (now part of MilliporeSigma/Merck) — the name similarity could be coincidental or could be an intentional attempt to borrow credibility from that established brand.\n- Peptide suppliers, especially those marketed toward research chemical or bodybuilding communities, vary enormously in legitimacy, purity, and legal compliance.\n\n**What I'd suggest instead:**\n1. **Search directly**: Try Google/Bing with terms like `\"Qingdao Sigma Chemical\" peptide price list` or check if they have a website/Alibaba storefront.\n2. **Check business registries**: Look up the company on platforms like Alibaba, Made-in-China, or China's National Enterprise Credit Information system to verify it's a real registered entity.\n3. **Verify COAs**: Any legitimate peptide supplier should provide Certificates of Analysis (COA) with HPLC/mass spec data, not just a price sheet.\n4. **Be cautious with unregulated peptides**: If these are research peptides, confirm they're being sold for legitimate research use (not human consumption) and comply with your country's import/export laws.\n5. **Cross-check reviews**: Look for independent reviews on forums (r/Peptides, science-focused communities) rather than relying on the seller's own marketing.\n\nIf you can share more context — like a link to their site, a product name, or where you found this company — I can help you evaluate the information more critically or figure out what questions to ask them directly.",
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