b12 injection side effects reddit Will injections and nasal spray really recover my severe deficiency? : r/B12_Deficiency Feeling worse after starting B12

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GI changes (constipation or diarrhea) are more often linked to B12 deficiency or underlying gut conditions that also impair B12 absorption

By controlling the ingredients, you can ensure it contains no preservatives or additives such as carboxymethyl cellulose (cellulose gum) and mannitol as many pre-packaged B12 injection kits did

The injection itself takes just a moment and is administered into a muscle, usually in your arm

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