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Source Naturals, L-Lysine, 500 mg, 250 Tablets

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In Stock
  • Expiration Date: Jun 2019
  • Shipping Weight: 0.71 lbs (0.32 kg)
  • Product Code: SNS-00140
  • UPC Code: 021078001409
  • Package Quantity: 250 Tablets
  • Dimensions: 2.9 x 2.9 x 5.3 in, 0.6 lbs (0.27 kg)
Product Overview


  • Free-Form
  • Dietary Supplement

L-Lysine is an essential free-form amino acid, which acts as a precursor for other amino acids, including L-carnitine (needed for fat metabolism). L-Lysine is crucial to the formation of collagen, a major part of the body's connective tissues. L-Lysine also contributes to energy production when converted to acetyl coenzyme A, one of the principal fuels for the Krebs Cycle.

Suggested Use

1 to 2 tablets daily.

Other Ingredients

Sorbitol, stearic acid, modified cellulose gum and magnesium stearate.

Suitable for vegetarians. Contains no yeast, dairy, egg, gluten, soy or wheat. Contains no sugar, starch, salt, preservatives, or artificial color, flavor or fragrance.


If you are pregnant, may become pregnant, or breastfeeding, consult your health care professional before using this product.

Do not use if either tamper-evident seal is broken or missing. Keep out of the reach of children.

Supplement Facts
Serving Size: 1 Tablet
  Amount Per Serving %DV
L-Lysine (HCl) 500 mg
† Daily Value not established.
iHerb Customer Reviews

Great for preventing and reducing cold sores

Posted by 5038518220721922283 on May 01, 2014

Product is an excellent price; so good that I have them sent to Adelaide, Australia at this price.

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Easy to take!

Posted by Reviewer1739184 on Dec 20, 2012

No herpes out brakes yet, we will see :)

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Posted by Reviewer3334900 on Jun 14, 2012

I take this everyday or if I have forgotton with a lysine balm when I feel the tingle of a cold sore and they never get any further than that!! I have suffered with cold sore's since a very small child and this is the first thing that has worked.

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Abdominal Aortic Aneurysm (AAA) reduces its size.

Posted by Reviewer2359537 on Feb 21, 2012

This extraordinary product taken concomitantly with other antioxidants (Melatonin, vitamin C with 100 mg Bioflavonoids NOW C-1000 -1 every 12 hours-, Proline), and Multi-Vitamin/Mineral, Iron-Free has helped me reduce the size of my Abdominal Aortic Aneurysm. I highly recommend. Very important: do not mix vitamin C with iron, as this mixture produces free radicals. If you should take iron, it takes 12 hours before or after, vitamin C. For now, doctors have decided not to intervene surgically to place a stent. Has been extraordinary. Note. - Reducing the size of the AAA is documented with CT's (Angio Computed Tomography)

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cold sores and canker sores

Posted by Reviewer2773279 on Jan 13, 2012

This is very helpful to prevent and shorten problems with cold sores and canker sores

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