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It stimulates the production of serotonin the feel-good hormone which, in turn, can help boost our mood
Vitamin B12 toxicity: Full list of potential side effects from injections or supplements VITAMIN B12 toxicity occurs when a person exceeds the recommended dosage of either supplements or injections
(MDPI journal) , 2026
Many people do not require large doses to maintain adequate levels
Treatment may involve oral high-dose B12 tablets or intramuscular hydroxocobalamin injections , depending on the underlying cause (see the following section for dosing detail)
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