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Br Med J 1968;3:102
The Cochrane Collaboration, Chichester, UK: John Wiley & Sons

Individuals who follow a vegetarian or vegan diet often have low dietary intake of B12, which can result in vitamin B12 deficiency

Symptoms of sciatic nerve pain How bad is my sciatic nerve injury

The other suggests an evidence gap that requires pharmacokinetic research before conclusions can be drawn
