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Guo Z, Ma X, Zhang RX, Yan H
Cataracts are thought to be the cause of 51% of blindness cases, as reported by the World Health Organization (WHO) [5]

The timeframe to which you see results depends on your supplementation strategy and the goals you have

To check whether these SNPs are associated with CVD or its risk factors via other phenotypes rather than via l-carnitine, we also assessed the association of these selected SNPs with potential causal factors for CVD, including Townsend index, education, smoking, and alcohol drinking in the UK Biobank, which are well-known factors affecting CVD and possibly l-carnitine
Species specificity profiling of rat and human organic cation/carnitine transporter Slc22a5/SLC22A5 (Octn2/OCTN2) Drug Metab Pharmacokinet