acetyl l carnitine long term use Acetyl-L-Carnitine 500 mg Acetyl L Carnitine (formerly Carni-Sorb)
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doi: 10.1093/advances/nmab071 [DOI] [PMC free article] [PubMed] [Google Scholar] [352].Liu X-H, Yu R-B, Liu R, et al

Studies of participants that took between 1 and 5 grams or 1,000 to 5,000 milligrams per day showed no adverse effects
However, addition of Fe resulted in 31% and 22% decrease of SOD activity in S-3/pKLH32 and S-3/pKLH337, respectively

In this case, the UGT1A1 gene of a patient has a mutation that changes a single protein building block (amino acid) in the UGT enzyme
