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This is why the NICE guidelines are very explicit: lifelong intramuscular vitamin B12 therapy

Transcellular pathway Lipids and lipophilic substances cross the intestinal barrier via diffusion along the apical plasma membrane of enterocytes into the circulation by the transcellular pathway

Reviews emphasize promising preclinical findings but limited robust human clinical evidence
The Foxtale Hula Hoop Bodycare Range follows the same approach of using active ingredients

Vitamin B12 is only found in animal-based foods, so people eating a primarily vegan diet may need to consider supplementing with a B-complex
