how long does bac water last for 101: Stop wasting it! Here's to properly store and reuse your Bacteriostatic Water peptides. Keep it clean. Keep it cold. Keep making progress. Tag someone who needs this BAC Water and Peptide Shelf
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Advanced Nutrition and Human Metabolism, 3rd ed
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The operative note must document the approach, and the code must reflect it

B12 is excreted (from 1-10ug (micrograms) per day) in the bile and reabsorbed

Using expired b12 could certainly result in you not receiving the proper dosage due to deterioration as you now likely suspect given your setback
