1 doctor weighed in:

Can strenuous exercise cause B12 deficit?

1 doctor weighed in
Dr. Doina Marina
Anti-Aging Medicine

In brief: No.

The liver stores a 3-year supply of vitamin b12.
True vegan vegetarians may need a supplement or vitamin B12 fortified food. In pernicious anemia diagnosed in 1% of people over age 60, impaired production of intrinsic factor interferes with B12 absorption. Complications of gastro-intestinal surgery (bypass, stapling), small intestine bacterial overgrowth and tropical sprue can cause b12 deficiency.

In brief: No.

The liver stores a 3-year supply of vitamin b12.
True vegan vegetarians may need a supplement or vitamin B12 fortified food. In pernicious anemia diagnosed in 1% of people over age 60, impaired production of intrinsic factor interferes with B12 absorption. Complications of gastro-intestinal surgery (bypass, stapling), small intestine bacterial overgrowth and tropical sprue can cause b12 deficiency.
Dr. Doina Marina
Dr. Doina Marina
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