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Vellinga is board-certified with the American Board of Internal Medicine and a member of the Institute for Functional Medicine
Elevated methylmalonic acid or homocysteine with normal-ish b12 suggests functional deficiency requiring supplementation
The key is understanding which symptoms are normal and which need medical attention
10.1042/BSR20200679 90 MoghettiP.CastelloR.NegriC.TosiF.PerroneF.CaputoM.et al (2000)
Efflux transporters: newly appreciated roles in protection against pollutants
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