Since phenylalanine converts to L-tyrosine, this could lead to low levels ... does not regulate dietary supplements the way ...

Aspartame provides significantly lower amounts of phenylalanine than everyday food sources, such as meat, fish, eggs, and dairy products. People with PKU need to monitor all dietary sources of ...

Levodopa is derived from the amino acid tyrosine. Related: Which Foods Are Actually 'Healthy'? The FDA Will Now Tell You “The body naturally can make tyrosine from [another amino acid] phenylalanine, ...

But, sometimes, no matter how many hydrating formulas you slather on your face or body, your skin can still feel parched (and that's coming from a beauty editor who tests products for a living).