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What are the side effects of phenylalanine?

ANSWER

It can trigger allergic reactions. Symptoms include:

Side effects may include:

Doses higher than 5,000 milligrams a day can cause nerve damage.

  • Itching
  • Swollen face or hands
  • Trouble breathing
  • Tingling feeling in the mouth
  • Heartburn
  • Fatigue
  • Nausea
  • Constipation
  • Dizziness
  • Headache
  • Anxiety and hypomania (a milder form of mania)
  • Sedation
  • Jitteriness and trouble sleeping

SOURCES:

Natural Standard Professional Monograph: "Phenylalanine."

AltCareDex, "Phenylalanine."

American Academy of Dermatology: "Vitiligo."

March of Dimes: "PKU (Phenylketonuria)."

Natural Standard Bottom Line Monograph: "Phenylalanine."

University of Maryland Medical Center: "Phenylalanine."

Reviewed by Christine Mikstas on May 29, 2019

SOURCES:

Natural Standard Professional Monograph: "Phenylalanine."

AltCareDex, "Phenylalanine."

American Academy of Dermatology: "Vitiligo."

March of Dimes: "PKU (Phenylketonuria)."

Natural Standard Bottom Line Monograph: "Phenylalanine."

University of Maryland Medical Center: "Phenylalanine."

Reviewed by Christine Mikstas on May 29, 2019

NEXT QUESTION:

Who shouldn't take phenylalanine?

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