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Methyl B12 is the preferred, or active form of B12, also known as methylcobalamin

Considering sublingual tablets or nasal spray for better absorption

When your body is unable to absorb vitamin B12 from your diet due to the condition known as pernicious anaemia, you may experience vitamin B12 insufficiency

Diagnosed Deficiency or Malabsorption if you have a confirmed deficiency in a vitamin that affects appetite (like B1, zinc, or iron) or a condition that impairs nutrient absorption (such as certain digestive disorders or post-surgical states), vitamin injections can be highly beneficial

But over time, such deficiency may cause anemia, nerve damage, and even problems with memory and reasoning

This aligns with the understanding that B12, as a key player in one-carbon metabolism, can influence ovarian response and embryonic development [9]