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Drop back to the last tolerated dose and stay there for 6-8 weeks before attempting escalation again

The United States Environmental Protection Agency (EPA) set the MCLG for total coliforms at zero because there have been waterborne disease outbreaks in which researchers found very low levels of coliforms

By comparison, oral B12 supplements are absorbed at roughly 1 to 5% in healthy adults, and even less if you have low intrinsic factor, atrophic gastritis, celiac disease, Crohn's, or a history of gastric bypass

However, modern advancements in supplement formulation have significantly improved the bioavailability of oral B12, making it a more effective option than ever before