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[9] The European Food Safety Authority (EFSA) also confirms that absorption through oral route drops significantly when doses exceed 1-2 mcg, meaning high-dose tablets rely mostly on passive absorption, which is inconsistent

[2] [4] Pernicious anaemia is a lifelong condition requiring indefinite treatment

[DOI] [PubMed] [Google Scholar] 168.Piper DC, Upton N, Smith MI, Hunter AJ

Most cosmetic medical treatments are deferred during pregnancy and breastfeeding out of an abundance of caution given the limited safety data in these populations

Chem Res Toxicol

Pull the plunger back to the line that matches your dose, then press the needle through the stopper and push that same amount of air into the vial