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Seaweed/Nori It may not technically count as seafood, but seaweed is still a solid source of vitamin B12

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However, if you experience any persistent or severe reactions, such as swelling, difficulty breathing, or other concerning symptoms, its important to contact your healthcare provider immediately

doi: 10.1186/2045-3701-4-29

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Both can prevent B12 deficiency, but methylcobalamin should be combined with adenosylcobalamin for best results