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I've been using some single dose ampules which expired 2/2022, they seem fine, based on my symptoms

Once dissolved, the solution should be kept refrigerated and used within a reasonable timeframe to prevent degradation

I cannot sleep until 4, 5, 6 or later the next morning

Once inside, while the benzyl alcohol will inhibit their growth, a large enough initial contamination or a particularly resilient strain of bacteria can overwhelm the preservative

Low levels are often linked to brain fog, poor concentration, and slower cognitive performance

Certain conditions that affect the digestive system, such as pernicious anemia, celiac disease, and Crohns disease, can interfere with the absorption of vitamin B12