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Yes and this is one of the most common reasons patients come to Sacramento Naturopathic Medical Center for B12 injections
This guide explains the difference between "still chemically present," "still sterile enough for a multi-use vial," and "still appropriate for a controlled research protocol." Quick Answer: 28 Days Is the Conservative Rule For general research planning, the cleanest answer is: reconstituted peptides usually last about 3-4 weeks in the refrigerator when mixed with bacteriostatic water and handled carefully
Last reviewed: June 11, 2026 Last updated: June 11, 2026 Written by: Jay Hastings, CEO of PlexusDx Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations
Some data are vendor-claims rather than peer-reviewed stability studies
