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Plant-based diets can lack vitamin B12 (B12), increasing deficiency risk. Oral B12 supplements are the safest way to maintain adequate B12 status for those on plant-based diets.

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Area of Science:

  • Nutrition Science
  • Dietary Studies
  • Public Health

Background:

  • Plant-based diets are globally popular and linked to health benefits like reduced cardiovascular disease and cancer risk.
  • However, poorly planned plant-based diets can lead to micronutrient deficiencies, particularly vitamin B12 (B12).
  • Vitamin B12 is naturally absent in plant foods, making deficiency a concern for vegetarians and vegans.

Purpose of the Study:

  • To review natural sources, metabolic needs, and biomarker data for vitamin B12.
  • To summarize current recommendations for preventing B12 deficiency in individuals on plant-based diets.
  • To address the scarcity of studies on optimal B12 supplementation doses and frequencies for healthy individuals.

Main Methods:

  • Literature review and synthesis of existing research on vitamin B12.
  • Analysis of metabolic requirements and biomarker status related to B12 intake.
  • Compilation of current recommendations for B12 supplementation in plant-based diets.

Main Results:

  • Plant-based diets require careful planning to avoid vitamin B12 deficiency.
  • Oral B12 supplementation is identified as the most reliable method to ensure adequate B12 levels.
  • Limited studies exist on specific B12 dosage and frequency for healthy individuals on plant-based diets.

Conclusions:

  • Preventing vitamin B12 deficiency is crucial for individuals adhering to plant-based diets.
  • Oral B12 supplements are recommended for maintaining adequate B12 status.
  • Further research is needed to establish precise B12 supplementation guidelines.