However, the oral route cannot be excluded as it did not depend on intrinsic factors only, as the simple diffusion (without the need for intrinsic factors) is now considered another mechanism for the absorption of vitamin B12 [49, 50]
Weight loss results are typically noticeable after several weeks of regular injections, particularly when combined with lifestyle adjustments such as improved diet and physical activity
In borderline cases, methylmalonic acid or homocysteine levels may be tested
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Difficulty concentrating, forgetfulness, or mental sluggishness
The Basics: What Are Vitamin B12 Injections