Vitamin B12 deficiency is one of the most common nutrient deficiencies in the UK, particularly for vegans, vegetarians, and people with health conditions such as Celiac Disease or Crohns Disease which makes it hard to absorb nutrients
However, it can take 3-6 months to fully recover
The fatty tissue just below the skin provides a slow and steady absorption rate, making it suitable for maintaining consistent B12 levels
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Vitamin B-12 and cognition in children
Vitamin B 12 can also be absorbed by passive diffusion, but this process is very inefficient only about 1% to 2% of the oral vitamin B 12 dose is absorbed passively (2)