can pregnant women take l carnitine L-Carnitine Benefits: A Complete Research-Based Guide Is it safe to take

So on the narrow question does it stop working after N weeks, the honest answer is: no published evidence says it does, and the mechanism actually argues against it

L-Carnitine is an amino acid found in high concentrations in heart and liver tissues where, inside the cells (mitochondria), L-Carnitine helps transform fats into energy (i.e., ATP)

doi: 10.1007/s00421-011-2012-2 38

Peptide therapy is a type of hormone replacement therapy (HRT) that uses natural or synthetic peptides to replace hormones that our bodies naturally produce

[1] The safety and efficacy of L-glutamine oral powder were studied in a randomized trial of subjects ages five to 58 years old with sickle cell disease who had two or more painful crises within the 12 months prior to enrollment in the trial