Phenylalanine exists in two forms, L-Phenylalanine and D-Phenylalanine. There is also a mixed form, DL-Phenylalanine that can be created in the lab. Phenylalanine is considered an essential amino acid because the body cannot produce it. Instead, a healthy diet that includes meat, fish, eggs, cheese and milk can help supply phenylalanine to the body. Phenylalanine is involved in protein synthesis and is the precursor of L-Tyrosine.
L-phenylalanine has recorded negative interactions with several drugs and it is not recommended that they be used together. These drugs include antipsychotic drugs, levodopa, monoamine oxidase inhibitors (MAOIs), and selegiline. As with all drugs and supplements, consult a health care professional before use.
L-Phenylalanine can cause occasional headaches, nausea, and heartburn in some people. Those with phenylketonuria and tardive dyskinesia should avoid taking phenylalanine supplements. Please take the recommended dosage to experience minimal side effects.
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