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Pure Lysine
Vita-Flex Nutrition — Item #11711
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Economical form of lysine

  • 9,099 mg of pure lysine
  • Lysine must be provided in your horse's diet because the body cannot make it on its own
Lysine is the protein component most often lacking in horses' diets. Pure Lysine provides a pure and economical form of this nutrient.

Learn More about Pure Lysine

View our Muscle Supplement Comparison Chart


Guaranteed Analysis:
(Maintenance Dose = 3 scoops (12 g) daily)
Ingredient Per Serving Per Pound
Lysine 9,099 mg 78.8%
Ingredient:: L-Lysine monohydrochloride.


Instructions for Use:
Enclosed scoop holds 4 grams.
For foals and weanlings up to one year: feed 1 scoop (4 grams) per day.
For maintenance of mature horses: Feed 1 to 3 scoops (4-12 grams) daily.
For broodmares, horses in heavy training or competition: Feed 2 to 3 scoops (8-12 grams) daily.

Clinical Research

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    out of 5
    92% of customers would recommend this product to a friend!
    Tell us what you think!

    The reviews provided on this website represent the experience of the individual posting the review. We do not adopt, edit, or endorse any of the submissions posted within the reviews section. Rather, the reviews are part of an online community of animal owners that desire to share their particular experience with other individuals. These reviews are not a substitute for discussing the health of your animal with a veterinarian.

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    Pure Lysine is rated 4.6 out of 5 by 97.
    Rated 3 out of 5 by from Good Product I recently started using this product on an older horse that has lost muscle tone. He has put on wieght elsewhere, but is still showing a noticeable loss of weight in his hindquarters and I was hoping to see the Lysine claims of increased muscle mass. After 60 days of use I can see great improvement in his hooves (I am a farrier so I was looking for that), his eyes and coat seem improved, but as it is winter time, its hard to tell!! There is no improvement to muscle mass anywhere. Will continue to use for at least 6 months and review again.
    Date published: 2010-12-30
    Rated 5 out of 5 by from WOW. This stuff is simply amazing! I ride my 17 yr. old hard and some one suggested this to me as a muscle builder to help process her protein. She said that it helps swaybacks also. My 17.1 TB has always been VERY sharkfinned and I noticed her losing topline muscle. I put her on this and the muscle around her withers is filling out so nicely! She also looks like she is adding muscle on her topline. My horse really doesn't like it but and I wish it came in pellest but eventually over the course of the day it is eventually consumed. I JUST SIMPLY LOVE THIS STUFF!
    Date published: 2010-12-30
    Rated 5 out of 5 by from keeps EPM horse hea.thy I use this for my 21 year old horse that had EPM as a 3 year old. It seems to work, have used this for 17 years.
    Date published: 2010-12-28
    Rated 5 out of 5 by from Great Product, great value I have been using this product for almost a year on my warmblood gelding who is not an easy keeper and within a few weeks he had started to gain weight without extra energy. He also added quite a bit of muscle and went from looking like a scrawny baby to a real grown up horse. His already shiny coat improve even further. I will definitely continue to use this supplement for him and highly recommend it to anyone who is considering it to try it, especially at such a reasonable price, there is nothing to lose!
    Date published: 2010-12-17
    Rated 5 out of 5 by from Never would have thought to try this! I started this supplement a month ago on my 11 year old, 16.3 hand HARD keeper TB. I have never dealt with a TB that was this hard to keep weight on (and I have seen some pretty hard keepers). We have tried everything! I read the info on Pure Lysine and decided for the price it was worth trying. In one month my constantly skinny, ribby TB has a full belly, no more ribs showing! He's actually filling out his blankets. I would highly recommend at least giving it a try!
    Date published: 2010-12-09
    Rated 5 out of 5 by from tried and true My horse had EPM as a 3 year old, he has been on this ever since and is now 20. He eats it no problem although he was more finicky of an eater as a youngster he still ate it.
    Date published: 2010-09-06
    Rated 5 out of 5 by from Great product at a great value This is one of the greatest supplements I've ever purchased. I have a warmblood in full training who is difficult to keep weight on, but I also can't increase his grain by much because he gets too hot. He has been on this supplement for almost a month and his coat looks great, he is no longer ribby and has added muscle too without giving him any extra energy. I even give a tiny pinch of this daily to my cat who has chronic upper resperitory virus, and her congestion has nearly vanished!
    Date published: 2010-05-27
    Rated 5 out of 5 by from Great results I have been using this for my horse's goopy eyes. He does have allergies in the spring/fall. No more goopy eyes or head tossing. A cheap fix, and he doesn't mind the taste.
    Date published: 2010-05-16
    Rated 5 out of 5 by from Excellent Product Pure Lysine is the best that I have seen as far as muscle builders. I have 3 thoroughbreds and I do Eventing/Dressage. Like a lot of TBs out there, my boys are protein sensative and can get very hyper on protein. The lysine works great for them because it uses the protein already in their system to build muscle. My boys have a definite improvement on muscle development since I started using this product :)
    Date published: 2010-05-07
    Rated 5 out of 5 by from really made a difference Added this to my elderly broodmare's senior ration and it really helped her keep weight on.
    Date published: 2010-04-20
    Rated 3 out of 5 by from Great for the money My 12 yerold quarterhorse gelding is a very hard keeper. Once i added the pure lysine ive noticed a difference on how much weight and muscle he has put on. Other owners in my barn keep asking me what ive done because they use hard keeper products. Those products dont suit my horse because of added energy. I found my missing link i his diet. Thank you.
    Date published: 2010-03-30
    Rated 5 out of 5 by from My 2 year old looks great! My 2 yo has been on this for months now and she came through the rough winter in excellent body condition.
    Date published: 2010-03-30
    Rated 4 out of 5 by from Too soon to tell I bought this on a recommendation from a friend who said it really helped her horse build muscle. Too soon to tell if it works, but my horse eats it no problem, and it's cheap!
    Date published: 2010-01-29
    Rated 5 out of 5 by from
    Date published: 2010-01-25
    Rated 5 out of 5 by from Quality of Lysine Bucket that I ordered I was surprised at the speed of my order fulfillment.I like the lysine--how it blends into my recipe.I paid $18.75 on my previous order, but this latest order cost me $24.95 I believe. I continure to look for a lysine bargain, but I haven't found one. I am recommending your lysine to others who use my recipe. If I find a better bargain, we might all switch together, I guess. On the other hand I like to look at the pictures of all the people in your crew, and the people have been nice to me on the phone. God bless your business and lunchtime parties.
    Date published: 2010-01-12
    Rated 5 out of 5 by from good stuff. I already have recommended it to Jason Keenan, now one of your customers, so he says.
    Date published: 2009-12-28
    Rated 5 out of 5 by from keeps my EPM horse going Although lysine is not the most palatable my horse has aquired a taste for this and now eats it top dressed. Having had a bad case of EPM as a youngster this seems to help maintain him.
    Date published: 2009-12-28
    Rated 5 out of 5 by from Lysine It was suggested I put my gelding on Lysine by my vet who specializes in acupuncture and chiropractic care. Some intermittent left hind lameness issues, which were hard to diagnose, and some other vague symptoms, led to the belief he may have a Lysine deficiency. Many pasture grasses, low in alfalfa, lack this amino acid. It has been about 3 months and we have seen a 100% improvement.You need a carrier to deliver it, not very tasty, I use timothy hay pellets with a bit of water.
    Date published: 2009-12-23
    Rated 5 out of 5 by from we use this product in our cat rescue group
    Date published: 2009-12-19
    Rated 5 out of 5 by from Feed to Rescued Cats & Dogs I have used Lysine in my rescued animals food for almost 20 years now. I use it as a preventative and as a treatment for colds, goopy eyes and for mouth problems in cats, dogs or horses. It goes in my animals food daily. Most animal foods have it in there, but the extra helps with colds, mouth problems and goopy eyes. Laurie, retired cat rescuer, still have 40 cats, 2 dogs, 3 horses and 1 pony. Had a little experience in making the dollar stretch to provide good health for all my animals.
    Date published: 2009-12-04
    Rated 5 out of 5 by from Buy in Bulk for Rescued Cats & Dogs This is a product that helps with colds, goopy eyes, and many other health issues. It is a daily supplement for the cats and dogs I have. I have learned to buy in bulk for the cats and dogs I have rescued through buying horse products for a better price and quantity. I have been buy this product for about four years now. It is one of the supplements I feel I cannot due without.
    Date published: 2009-10-30
    Rated 4 out of 5 by from
    Date published: 2009-10-29
    Rated 5 out of 5 by from Muscle on Muscle I was so worried about getting my mares topline back up and this really helped develop it quickly. Didn't really have a problem with feeding as long as I used oil.
    Date published: 2009-10-07
    Rated 5 out of 5 by from Lysine for my OLD horse I have aways been happy with this manufacturer's products. When I analyzed my senior horse's diet, I found he was not getting enough lysine. I immediately put him on Pure Lysine, and now KNOW he is getting the lysine he needs. He completely cleans his feed bucket, so there is NO issue with palatability. Five stars for this product and SmartPak.
    Date published: 2009-08-20
    Rated 5 out of 5 by from Great product My vet told me to put my gelding on this product due to his cronic scratches. So far we have had no reoccurrance! The cost of this supplement is WAY cheaper than the cost and headache to treat the scratches!! Highly recommended!!
    Date published: 2009-07-09
    Rated 5 out of 5 by from I swear by Lysine My mare is HYPP N/H and has to eat grain hay (we get oat/barley/wheat mix out here) and reliability for quality fluctuates wildly. You would not know that the horse is not eating alfalfa by looking at her. The topline is filled out and she doesn't have that "wasty" look horses can get when they eat only grain hay.
    Date published: 2009-06-17
    Rated 4 out of 5 by from
    Date published: 2009-06-08
    Rated 5 out of 5 by from great product This product is wonderful. It definitely seems to have done the job! I haven't given my horse any more feed than normal, and he has packed on the pounds! Once a super-skinny boy (even for a thoroughbred!), now he is perfectly fit and healthy.
    Date published: 2009-05-04
    Rated 5 out of 5 by from Essential to the health of our animas
    Date published: 2009-04-27
    Rated 3 out of 5 by from horse wouldnt touch it... and he is not AT ALL picky or finicky. he eats bute like its going out of style!!! but this...wouldnt touch.
    Date published: 2009-04-23
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