A community group-buy test caught an ERP SS-31 batch underfilled about 12% and high in endotoxins, and buyers say ERP gave store credit, not refunds.

Shanghai ERP Biotechnology, a high-volume China vendor with US, Canada, and China warehouses, sold via Telegram and WhatsApp.

Where it trips our checks

• Batch testing: a group test found one SS-31 batch underfilled near 12% with high endotoxins, while other products test at label or over. An independent test contradicting a batch is a signal we weigh heavily.
• Purchase protection: affected buyers report future-order credits rather than refunds, and some say complainers were banned.
• Independent feedback: mixed, with many clean deliveries alongside the SS-31 complaints.
• Promotional signal: several reps (Emmy, Linda, Harper) run constant flash-sale and wholesale promos.

Sources

• The reader who vouched for ERP as "one of the best."
• A glp1forum thread on the SS-31 underfill and endotoxin group test and ERP's credit-only response; ERP also posts Janoshik COAs.
• The vendor's own Shanghai ERP Biotechnology forum and WhatsApp/Telegram reps.

Bottom line: Not a scam; ERP is an established, mostly-delivering vendor, but a documented bad batch and a credit-only, ban-happy response keep this at some caution.

— maxg Founder of Ouros Lab. I write the seller research notes here.