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Medically reviewed by Last updated on Oct 2, 2020.

What are other common names?

  • 2,6-diaminohexanoic acid
  • Alpha-epsilon-diaminocaproic acid
  • Hydrochlorure de L-Lysine
  • L-2,6-Diaminohexanoic Acid
  • L-Lysine
  • L-Lysine HCL
  • L-Lysine Hydrochloride
  • L-Lysine Monohydrochloride
  • Lisina
  • Lys
  • Lysine HCl
  • Lysine Hydrochloride
  • Lysine Monohydrochloride
  • Monochlohydrate de L- Lysine
  • Monochlohydrate de Lysine

What is this product used for?

Lysine is used by some people to help with herpes infections and cold sores. Others believe it helps with osteoporosis. Some use lysine to help with diabetes. Some people believe it helps with chest pain. Some people use lysine to help with migraines or other kinds of pain. Others believe it helps to lower anxiety.

What are the precautions when taking this product?

  • Always check with your doctor before you use a natural product. Some products may not mix well with drugs or other natural products.

  • Do not use this product if you are pregnant or plan to become pregnant soon. Use birth control you can trust while taking this product.

  • Do not use this product if you are breastfeeding.

  • Avoid taking a large amount of calcium supplements while taking lysine.

  • Take extra care and check with your doctor if you have:

    • Kidney problems

    • Liver problems

    • An infection or are taking antibiotics

What should I watch for?

  • Upset stomach

  • Rash

When do I need to call the doctor?

  • Signs of a very bad reaction. These include wheezing; chest tightness; fever; itching; bad cough; blue skin color; seizures; or swelling of face, lips, tongue, or throat. Go to the ER right away.

  • Signs of kidney problems. These include pain with passing urine, passing more or less urine than normal, feeling tired, or change in color of urine.

  • Very bad throwing up

  • Very bad belly pain

  • Very bad loose stools

Last Reviewed Date


Consumer information use

This information is not specific medical advice and does not replace information you receive from your healthcare provider. Only your healthcare provider has the knowledge and training to provide advice that is right for you. You should not rely on this information in deciding whether or not to use, or accept your healthcare provider’s advice regarding use of, any natural products or similar treatments, therapies, or life-style choices. This information does not endorse any natural products or similar treatments, therapies, or life-style choices as safe, effective, or approved for treating any patient or health condition. This is only a brief summary of general information. It does NOT include all information about natural products, possible uses, directions, warnings, precautions, interactions, adverse effects, or risks that may apply to you. You must talk with your healthcare provider for complete information about your health and treatment options.


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Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.