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I put two syringe full of B12 under my tongue for 30 seconds before swallowing

Vitamin D and fertility are closely related

To improve the accuracy, the results of the HACH kit were compared with the results by using a TOC analyzer (Shimadzu TOCV CPH combined with the ASIV)

Absorption Problems Some individuals consume enough B12 but cannot absorb it due to conditions such as: Pernicious anaemia: An autoimmune condition that affects stomach cells that produce intrinsic factors needed for B12 absorption Atrophic gastritis: Thinning of the stomach lining Lupus and B12 deficiency: Autoimmune diseases like lupus can reduce B12 absorption Surgical or Medical Interventions People who have undergone gastrointestinal surgeries (like weight loss surgery) or those taking certain medications (e.g., metformin or proton pump inhibitors) are at higher risk