l carnitine with protein OXYENERGY RIPFUEL DAILY – Premium Multi-Source Protein Vitamins, Minerals & L-Carnitine and tested formulas are value loaded L-Carnitine: An Amino Acid Supplement
Description
Some people are Carnitine non-responders according to evidence but this isnt a side effect as much as it is a lack of benefit

The iodine-selenium connection: Its possible roles in intelligence, cretinism, sudden infant death syndrome, breast cancer and multiple sclerosis

Studies have proven that TP significantly boost the number of beneficial gut bacteria Akkermansia, which regulates host lipid balance through interactions with lipid metabolites, reducing endotoxin levels, increasing short-chain fatty acid production, and promoting fatty acid oxidation (120, 121)

10.1038/s41585-018-0117-7 100 TwidwellJ.LevineL