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A lack of vitamin B12 can cause a variety of health issues, including fatigue and permanent neurological changes
This ensures effective treatment and reduces the risk of side effects
Ruenzi et al., 2005) and in experimental rat studies (see Seiwerth et al., 2018), a point recently confirmed (Xu et al., 2020)
For borderline B12 results, additional tests such as holotranscobalamin, methylmalonic acid, or homocysteine may be helpful
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