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Vitamin B12 is an essential nutrient, and deficiency can lead to severe complications and ill health
Pre-workout injection is the second most common timing
Available at: Accessed 4/7/2015
Additionally, testing for biomarkers such as methylmalonic acid (MMA), may provide valuable insight and help catch B12 deficiency in the earlier stages you can also self-order an MMA lab test via Ulta Lab Tests
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