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Vitamin C in extremely high doses (more than 1000 mg taken with a b12 supplement) may reduce b12 absorption when taken together

Cellular Aging & Longevity NAD+ is crucial for activating sirtuins, proteins that regulate aging and inflammation, and promote healthy cell function

If you have low levels or a proven deficiency, you may benefit from supplementation which can be discussed during a consultation where you may be prescribed Vitamin B12 booster injections

[21] [22] This condition impairs B12 absorption in the terminal ileum and typically requires lifelong parenteral replacement therapy

Metformin, the first-line oral glucose-lowering agent recommended by NICE for type 2 diabetes (NG28), is well established as a cause of B12 malabsorption