Is l carnintine safe to take while i am breast feeding ?

Probably safe: Levocarnitine and acetyl-l-carnitine (acetlycarnitine) are normal components of human milk that are required for fat metabolism. It appears unlikely that maternal levocarnitine supplements during nursing would be harmful to the infant, but until more data are available, it is probably best to avoid levocarnitine. Any doubts about any chemicals: http://toxnet.nlm.nih.gov/cgi-bin/sis/htmlgen?LACT