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Below that point the numbers are not proportional oral absorption is far lower and less predictable than subcutaneous absorption, which is why the oral strengths are numerically much higher
G.FukadaS
This potentially makes them more susceptible to oxidative stress and nerve damage
These can be signs of an early B12 deficiency or other nutritional deficiencies like folate, vitamin B2 (riboflavin), and vitamin B3 (niacin) deficiency
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