Pen against vial
The same peptide in the format most shops sell.
For context, the 70 mg vial most shops carry runs about $109.50 across 16 listings, $1.56/mg, with the lowest at $50.83 from Alpha Peptides. The best-priced pen here works out at $3.80/mg (Peptide Perfection, Glow Blend 50 mg Pen), 143% more per milligram than the typical vial; the dearest is $6.40/mg. Every vial listing is on the GLOW blend price page.
The suppliers, by score
Format as published, certificates we opened, how you pay and where it ships.
Peptide Perfection sells prefilled 1 mL dual-chamber pens only, one fill per listing, with a QR code on each carton that opens its batch certificate. We opened twelve certificates from it, signed by Vanguard Laboratory, each tied to a lot number. It ships free from $150, ships within the US only. Returns: All sales final; damaged, defective, incorrect or missing items replaced/refunded if reported within 7 days of delivery with photos; refunds to original payment method in 5-10 business days; original shipping non-refundable
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)