can you use bac water after 28 days How to Store Opening Bac Water: A Clear Guide
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That decision is made in consultation, based on the individual patients labs, history, and goals

Beyond this window, degradation accelerates even under refrigeration

There is around a 2.5-fold increase in B12 deficiency incidence in those treated with metformin, and this may occur as early as 3 months, although hepatic stores of vitamin B12 may take 5 years or more to deplete (Bell, 2022)
Oral supplements work for some, but if you have absorption issues, injections are much more effective
