what does l carnitin do for the body L-Carnitin Liquid l-carnitine: Nutrition, pathology, and health
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The injection form bypasses intestinal absorption limitations (intrinsic factor dependence), so patients with malabsorption issues may benefit more from injectable B12 than oral supplementation

10.1016/j.bbrc.2017.11.014 160 LiuM.ZhengM.XuH.LiuL.LiY.XiaoW.et al (2015)

doi: 10.1016/j.fct.2008.12.020
Chapuis P.-O
