l carnitine constipation L-Carnitine: Benefits, Uses, and Side Effects does l carnitine cause constipation
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This form of vitamin B12 is naturally occurring and can be found in both food and supplements

10.1126/science.1233606 Science 25 MengH.LiuY.LaiL

doi: 10.1016/j.bcp.2008.07.036

Science 325 , 332336 (2009)

One-carbon metabolism in health and disease
