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When assessing for vitamin B12 deficiency, in addition to checking a vitamin B12 level, consider ordering a methylmalonic acid level or a holotranscobalamin level and CBC (to assess for red blood cell size)

Thyrotoxicosis and Hyperthyroidism
Collagen Supplements: Taken orally and broken down into amino acids and peptides during digestion

Brems H, Chmara M, Sahbatou M, Denayer E, Taniguchi K, Kato R, et al

10.1021/acsnano.8b05937

Warnecke PM, Mann J, Frommer M and Clark S
