L-Lysine Review

Editor's Review: 2.8 / 5.0

What You Should Know

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L-Lysine is an essential amino acid that is used as a building block for protein in the body. The body does not synthesize L-Lysine and thus food sources are needed for healthy living and energy production. Common food sources include red meat, spinach, buckwheat and eggs. Soybeans also provide a good source of L-Lysine. Some supplement manufacturers include L-Lysine in their weight loss and fitness supplements and market the ingredient for increased muscle building and decreased recovery time between workouts.

List of Ingredients

L-Lysine – essential amino acid.

Product Features

The average person should consume between 1 and 1.5 grams of L-Lysine every day. L-Lysine deficiency is rare and is often associated with some sort of inability to digest protein or a strictly vegan lifestyle. Each serving of meat contains about 2 grams of L-Lysine and thus more than the recommended daily amount. L-Arginine does compete with L-Lysine for absorption so consumption of too much L-Arginine can affect L-Lysine levels in the body, but not often enough to cause deficiency.

Toxicity seems to me more likely than deficiency. According to the Journal of the American College of Nutrition, up to 3 grams of L-Lysine may be taken in addition to the L-Lysine absorbed with food without toxic effects. Above that amount and there is question whether the essential amino acid is safe. L-Lysine aids in the absorption of calcium, muscle growth, muscle recovery after injury or repair, and the production of enzymes, hormones and antibodies.

L-Lysine can be purchased as part of a weight loss or fitness supplement or as a standalone supplement. The price of L-Lysine is about $7.50 per 60 tablet bottle of 1000 mg. One gram is equivalent to 1000 mg. There is no evidence that L-Lysine will increase muscle size, weight loss or fat burn.

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Advantages

  • L-Lysine is essential for healthy muscle growth and repair.
  • Many supplement companies sell the product for a fraction of the price of other fitness supplements.
  • In depth, scientific information can be found on the function of L-Lysine in the body.

Disadvantages

  • L-Lysine will not affect weight loss.
  • Increased muscle size is not a side effect of taking more L-Lysine.
  • Most people, even vegetarians and some vegans, consume enough L-Lysine in the diet.
  • Too much L-Lysine can lead to toxicity.

Conclusion

There is no reason to supplement a typical diet with more L-Lysine. This essential nutrient is easy to come buy naturally with an average of two grams being consumed with every serving of meat. One serving size of meat is about the size of a deck of cards. While consuming too much L-Lysine can be a problem, there are few known cases of L-Lysine deficiency. Increased fat burn and calorie burn will not occur when taking this amino acid.

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9 User Reviews about L-Lysine

  • 1
    Jake van der Koogh

    L-Lysine has building blocks for muscles etc.
    Would it also be beneficial for people with M.S.
    Hope to hear for you soon

    Jake

    [Reply]

    MICHELLE

    YES IT IS! ALSO FOR VERTIGO AND SUFFERERS WITH MENIERES DISEASE AS WELL AS HERPES VIRUS.

    [Reply]

  • 2
    Al Vaicius

    I have noticed that after taking lysine my blood presure was 20-30 points lower,i have problem in cotroling pessure with all kinds prescripture medsAnd lysine helps Al

    [Reply]

  • 3
    LeAnna Hall

    Can my daughter take L-lysine for a fever blister while she is pregnant?

    [Reply]

  • 4
    michael C

    I was told that L-Lysine was good for cold sores. What do you think or know ?

    [Reply]

    Anonymous

    When you take it at the first signs{the tingle}1000mgs in the am and pm,it either stops the sore or lessens the outbreak!I have been using it for over30 years!

    [Reply]

  • 5
    Wayne R. Gilbert

    I began taking 1000mg daily of L-lysine to reduce the incedance of canker sore in my mouth. I get far fewer cankers and the duration is shorter when I do get one.
    I belive my cankers are caused because I consume a lot of food and drink containing acid.

    [Reply]

  • 6
    Elias Frazis Tirikos

    A FRIEND OF MINE BROUGH FROM ENGLAND THE FOLLOWING HOLLAND & BARRETT PRODUCTS FOR MY DAUGHTER 16 YEARS OLD PROFFESSIONAL SWIMMER IN NATIONAL TEAM OF GREECE .
    1. L – LYSINE 1000 MG
    2. GUARANA 800 MG
    3. TAURINE 500 MG
    4. KOREAN GINSENG 500 MG
    5. ROYAL JELLY 100 MG

    PLS I WANT TO KNOW YOUR ADVISE AND INSTRUCTIONS FOR PREPARATION AND PERFORM IN PEAK CONDITION. ALSO IF I NEED MORE PRODUCTS PLS LET ME KNOW WITH YOUR INSTRUCTIONS

    [Reply]

  • 7
    Carolyn Miller

    My father is on dialysis. All of medical people agree that this supplement is not appropriate for dialysis patients. There should be a specific warning regarding the high K rate in this drug.
    Carolyn R. Miller, RN

    [Reply]