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Yes, you do

Randomized controlled trials demonstrate oral vitamin B12 as effective for many individuals, often offering a cost-saving, convenient b12 supplement alternative to injections

Does the effect actually diminish over time

Many are unsure if they are at risk of a vitamin B12 deficiency, if you are wondering if you are or what the symptoms may be to look out for, individuals with a vitamin B12 deficiency may include: Elderly Anyone who may have had previous surgery that included removing part of the bowel that absorbs vitamin B12 Any individual on metformin for diabetes Anyone that is following a strict vegan diet Anyone taking long-term antacid medication for heartburn What is Vitamin B12

Since Vitamin B12 injections bypass the digestive system, its effects can be more potent than supplements