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what's the difference between bac water and sterile water is short right now. What matters is what people do next Bacteriostatic Water | Overview, Application
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[DOI] [PMC free article] [PubMed] [Google Scholar] 74.Ohkubo, M., Ohta, K., Inoue, K

Assuming patients are compliant with their postoperative visits, we can typically detect and treat any vitamin deficiency very quickly, before the patient experiences any significant symptoms

This is because the risks of delaying treatment while waiting for B12 deficiency diagnosis, disproportionally outweigh the benefits of taking action

When to consider B12 injections
Pregnancy and breastfeeding are also contraindications due to insufficient safety data

Greger may be referring, watch the above video