are vitamin b12 injections better than pills vs. Supplements – Known Nutrition UK Vitamin B12 Injections vs. Supplements:

Allergic Reactions Though uncommon, allergic reactions to B12 injections can happen

Certain Medical Conditions Individuals with certain medical conditions, such as pernicious anemia, may experience B12 deficiency as their body cannot produce enough intrinsic factors, a protein necessary for B12 absorption

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Three to four weeks People with good absorption may still experience benefits, though many improvements linked to deficiency settle down sooner

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A person deficient in B12 may experience diarrhoea because a lack of B12 can impact the digestive tract