Bremelanotide comes in 10mg and 2mg vial sizes. Peptides in photo are synthesized by the same laboratory, contain no filler and the difference is visible (this is not always the case). Most PT-141 comes in the industry standard 10mg size. The 2mg PT-141 is exclusive to supplier. As a lifestyle peptide, the 10mg product is a lot to consume and may offer up to 20 doses when dosing light. The PT-141 peptide reconstituted with bacteriostatic water remains potent in the fridge for months. Nasal sprays, pre-mixed PT-141, pills and loose powder are not legitimate. There are successful reports of nasal spray experiences...however they are few and far between.* Freeze dried Melanotan peptides (PT-141) are very durable and stable. Store PT141 bremolanotide in the refrigerator.