Pen against vial
The same peptide in the format most shops sell.
For context, the 5 mg vial most shops carry runs about $48.49 across 30 listings, $9.70/mg, with the lowest at $22.80 from Trident Peptide UK. The best-priced pen here works out at $7.77/mg (Direct Peptides, TB500 Pre-Mixed Pen 5mg Peptide – Cartridge: 1 pre-mixed cartridge), under the typical vial per milligram; the dearest is $14.63/mg. Every vial listing is on the TB-500 price page, and the best TB-500 suppliers page ranks the shops that carry it.
The suppliers, by score
Format as published, certificates we opened, how you pay and where it ships.
Direct Peptides sells pre-mixed cartridges that fit a reusable pen, priced in pounds, either as a single cartridge or as a cartridge with a pen kit. It says its certificates are public, but we opened none during this check. It takes card, wire, zelle, ships abroad. Returns: Returns not accepted; damaged product replaced; orders not yet dispatched can be cancelled for full refund by emailing info@direct-peptides.com
American Research Pens
americanresearchpens.comAmerican Research Pens sells single-strength dual-chamber pens at one flat price each, under the same coded product names as Peptide Perfection. We could open no certificate from it during this check, so there is nothing to tie a pen to a tested lot. It takes card, wire, ach, e-check, crypto, ships free from $250, ships within the US only. Returns: Refund or replacement if pen arrives damaged, wrong item shipped or order not delivered (photos may be requested); no refund for change of mind on opened pen or customer error after a 3-hour correction window; crypto payments final (store credit only)