However, some studies report that in some cases, a sizeable percentage of supplemental NALT is excreted in urine before its converted into L-Tyrosine.[iv] On a personal note, I havent had any issues using NALT as a source of L-Tyrosine
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10.1038/clpt.2013.157 89 LiJ.JiaH.CaiX.ZhongH.FengQ.SunagawaS.et al (2014)
Vitamin C is very important in elderly people, patients with gastrointestinal problems like inflammatory bowel disease, chronic smokers, patients with food allergies, people who are taking high fat-containing foods, and people with liver diseases