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Skin reactions or injection site effects may occur with B12 supplementation but are not caused by elevated serum levels
As we age, our stomachs produce less acid, which makes it harder to absorb B12 from food
Headaches during initial use Headaches represent the second most commonly reported side effect
Yes, injections are more effective for people who cannot absorb B12 properly, as they bypass the digestive system and deliver the vitamin directly into the bloodstream
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