It is distributed exclusively for laboratory research and investigational purposes
However, some plant-based sources contain bioactive B12[20]: Dried Purple Laver (nori) : Considered the most reliable natural B12 source for vegetarians, it also provides iron and omega-3 fatty acids
In one large study involving 4,281 participants, researchers compared vitamin B12 levels in people receiving intramuscular injections with those taking sublingual methylcobalamin
These micronutrient deficiencies don't just affect specific tissues
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