NOW Supplements, L-Lysine (L-Lysine Hydrochloride) 500 mg, Amino Acid, 250 Tablets

(426 Reviews)

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$9.85

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(20000 available )

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98 Ratings
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  • rhodabe

    > 3 day

    One a day, no more cold sores.

  • C.A. Johnson

    06-06-2025

    3 pack purchase made it worth the price. NOW Food quality has always been good and I am pleased with their products.

  • Mallie Renner

    > 3 day

    Now always seems to work well.

  • Adonis Carroll

    > 3 day

    I take two pills a day, and I havent had any canker sores since I started. If I forget to take them for a day or two, they start coming back. I gag easily on large pills, and these are very easy to swallow.

  • kululu99

    11-06-2025

    I take this to prevent fever blisters. Supposed to be good to prevent Shingles. It is an essential Amino Acid.

  • MaggieD

    > 3 day

    I didnt notice tablets (didnt even know it came in tablet form) so will not work for sprinkling on cat food. I will take it myself and get capsules for my cat. As for the L-Lysine, all my cats have loved it on their food. A vet recommended it years ago for respiratory and immune system support for my one purebred who came to me with an incurable respiratory condition which the vet expected would kill him (my cat, not the vet). He lived to be 14 - the oldest lived cat Ive ever had (except for his litter-mate brother who is still alive and in good health). Its impossible to know if the L-Lysine was directly responsible for his long life but it certainly didnt hurt.

  • Debra Jo Smith

    > 3 day

    I have a problem with biting my gums when I eat and get mouth ulcers from it. This helps me.

  • coelmun

    Greater than one week

    Starting taking and I’m already feeling a lift in my mood and energy, maybe just the placebo effect but still solid.

  • Jon Cook

    > 3 day

    These are a great vitamin supplement.

  • Peter Keiley

    > 3 day

    I have 2 children that were prone to severe fever blisters. I dont give it to them on a daily basis but when I do notice redness around their lips I know one is coming on. Ill then give them the recommend dose for about a week and 9 times out of 10 the blister never appears.

L-Lysine is an essential amino acid, which means that it cannot be manufactured by the body and must be obtained through the diet or by supplementation. Lysine is necessary for the production of all protein in the body including hormones, enzymes, and antibodies, as well as carnitine and collagen, which is the structural protein forming all connective tissue such as skin, tendon, and bone. L-Lysine also plays a major role in calcium absorption. Some evidence suggests that L-Lysine supplementation may help to support a healthy immune system as well as proper cardiovascular function.*

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