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Naldini et al., 1991)

Over-the-counter B12 supplements are widely available in the UK in various forms, including: Cyanocobalamin tablets the most common form in supplements Methylcobalamin sometimes marketed as more bioavailable, though evidence for superiority over standard oral tablets is limited Sublingual (under-the-tongue) preparations no proven advantage over standard oral tablets has been established Combination B-vitamin complexes Patients should be aware that most supplements are regulated as food products , not medicines, and quality can vary between brands

And you probably do not even know it

Common signs of possible vitamin B12 deficiency can include fatigue or weakness, brain fog or memory issues, shortness of breath, pale or jaundiced skin, and tingling or numbness in the hands and feet

Within 24-48 hours is when most notice the difference

With age, your stomach cells become less efficient and secrete less hydrochloric acid, which means you absorb less B12