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Senior Flex H/A Pellets
Med-Vet Pharmaceuticals (MVP) — Item #18381
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Supports seniors in three key areas

  • All of the joint health ingredients of Senior Flex plus 50 mg of hyaluronic acid for extra support
  • Includes vitamin A & vitamin E for antioxidant support, plus probiotics for healthy digestion
Senior Flex H/A is a unique combination of joint, digestive and antioxidant support for the senior horse. Provides 50 mg of hyaluronic acid, 5,000 mg of glucosamine, 500 mg of chondroitin sulfate, 5,000 mg of MSM, 5,500 mg of yucca, 1,200 mg of Ester-C, 15,000 IUs of vitamin A, 1,000 IUs of vitamin E, and probiotics to aid in maintaining body condition and digestive function. Your senior horse will love these tasty pellets!

View our Joint Supplement Comparison Chart 


Active Ingredients per 1 oz:
(Maintenance Dose = 1 scoop (1 oz) daily)
  • Yucca Schidigera Extract
    5,500 mg
  • Glucosamine Sulfate (Shellfish)
    5,000 mg
  • Methylsulfonylmethane (MSM)
    5,000 mg
  • Ester-C®
    1,200 mg
  • Chondroitin Sulfate (Porcine)
    500 mg
  • Hyaluronic Acid
    50 mg
  • Vitamin A
    15,000 I.U.
  • Vitamin D3
    5,000 I.U.
  • dl-Alpha Tocopherol (Vit. E)
    1,000 I.U.
  • Direct Fed Microbials
    9.3 million CFU's
Inactive Ingredients: : Alfalfa meal, apple flavoring, dry sweetener, rice bran and yeast culture.


Instructions for Use:
Adult Horses (900-1,100lbs): Provide 1 ounce twice daily during high level stress and/or working conditions. For lower maintenance level, provide 1/2 measure twice daily. This level may be doubled for the first 14-21 days.

SmartPak has received permission from the manufacturer to provide 1 ounce daily in SmartPaks for maintenance.

Clinical Research

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    out of 5
    98% 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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    Senior Flex H/A Pellets is rated 4.8 out of 5 by 45.
    Rated 5 out of 5 by from My horse goobles it up
    Date published: 2015-01-13
    Rated 3 out of 5 by from good supplement
    Date published: 2014-11-10
    Rated 5 out of 5 by from Extremely palatable My gelding is a fairly picky eater so supplements are a challenge. I was concerned he would eat around his Senior Flex H/A Pellets. Boy was I wrong! Harley prefers his supplements as a treat before his grain! He is 21 and going strong & I want to insure he remains as healthy and happy as he is now.
    Date published: 2014-04-28
    Rated 5 out of 5 by from Senior Flex H/A Pellets I like the pellet form, no granules to eat around. The horse I'm giving them to, seems to be less stiff. Thanks.
    Date published: 2014-01-11
    Rated 5 out of 5 by from More flexibility Since using this product my Baskir Curly Mare, who has severe Carpitits in both front knees, has show improved flexibility in both knees as noticed by myself and my farrier. Thank you SmartPak for recommending it. 
    Date published: 2013-12-19
    Rated 4 out of 5 by from My mare definitely acts younger! I have a 16 year old halter-built Paint mare that is my primary riding horse. Since putting her on Senior Flex H/A pellets I'm convinced I'm riding a younger horse. She's more supple, but she's also a LOT more energetic and opinionated. I'm not sure if it's because she has less pain, or it's just another effect of the supplement. It is mostly a good thing but, yeah, not always. :)
    Date published: 2013-11-22
    Rated 5 out of 5 by from Great product I am using this on a non-senior horse. It has a great combination of ingredients and is a super value for the price. My horse eats it right up.
    Date published: 2013-09-02
    Rated 5 out of 5 by from Feels like a 10 year old! I have a 26 year young Swedish Warmblood/TB X and even though I do not work him as much as we used to due to my schedule starting a new business, when we do ring work, he jumps into it and really enjoys the workout! I have ridden younger horses that I can feel their stiff joints but amazingly, my 26 year old still feels GREAT after his warm up and he also LOOKS great too! I do give much of the credit to this supplement and even though I have budget concerns at the moment, I would never consider cutting Senior Flex out of his diet.I attached a photo I took on his 26th birthday May 5th this past Spring and he was not totally shed out yet. He looks much better once all his winter coat is gone and he is sleek and his coat gleams in the sun.
    Date published: 2013-08-27
    Rated 5 out of 5 by from Senior Flex H/A Bought this as a joint supplement. I have a 20y/o large warmblood gelding who continues to do very well with lower level jumping and dressage, people tell me he moves well for his age. In addition, it helped him to not have loud, gassy digestive sounds.
    Date published: 2013-08-14
    Rated 5 out of 5 by from Great for older horse's joints! I have a 30 year old Pinto gelding. When I got him about 3 years ago, he was underweight, all beat up by other horses, and lame. His teeth were also in horrible shape. I took him to the vet, had his teeth floated, got him wormed, and had him looked over. The vet said that horse is "OLD." But I loved him; he needed me, and I needed him. So I took him home, gave him a name, groceries, and started him on SmartPaks Senior Flex H/A Pellets. I did have the horse chiropractor out a time or two. I do believe the pellets took down the swelling in his leg joints and stopped his limping. He just started feeling better and better. He used to go around the arena with his nose dragging the ground like he had no energy and was just about to fall down. As a matter of fact he did fall down a couple times. One time I was riding him, and one time all I was doing was taking the saddle off. He just fell on his front knees. After giving Rio his SmartPaks, I would say that it was about 2 or 3 months when I really noticed he had some gitty up and go. I took him on a trail ride; he wanted to trot the whole way! He was excited, happy, and looking around. His ears were up, and he just acted like he was having a real good time. He felt good and was back in his element. Thank you SmartPaks for all you have done for my Rio. He would thank you himself if he could!
    Date published: 2012-11-10
    Rated 2 out of 5 by from Not really Impressed I bought this product mostly because of it's reviews. However, I don't see a difference in my horse at this time. He is still stiff when moving around and is still cracking and creaking in his joints.
    Date published: 2012-10-30
    Rated 4 out of 5 by from Seems to work Seems to work, hard to tell though...
    Date published: 2012-10-17
    Rated 5 out of 5 by from My Picky Eater Likes It For whatever reason, my picky eater stopped eating the SmartFlex Senior (pellets and powder). Luckliy SmartPak to the rescue with the taste samples and Mr. Picky ate these! Wahoo! I'm so happy to have my 30 year old back on a joint supplement and he's shown a peppier step these last few weeks! THANKS!
    Date published: 2012-09-25
    Rated 5 out of 5 by from Best Senior Product out there! I have a 20 yo Thoroughbred mare that we're schooling 2nd level dressage. We've tried several different supplements, including the Senior Flex without the HA. Wow, what a difference this has made. She regularly acts like she's a 3 yo! She's an energetic and very athletic horse to begin with; however, she would have times that she was stiff ...she's been on this for over a year now and she just keeps getting more fit and feeling half her age.
    Date published: 2012-09-25
    Rated 5 out of 5 by from Pellets are Great Choice I have been using the Senior Flex in the powder form about a year and a half for my 28 yr half arab mare. She was somehow filtering out the flex and leaving it in her tub. After switching to the pellet form two months ago she is getting all of it and is actually cantering and sometimes giving even a buck or two racing to the pasture in the morning. Happy to have the choice.
    Date published: 2012-08-23
    Rated 5 out of 5 by from Great Product I put my 14 yo OTTB on this product because he was starting to seem "creaky" and was no longer responding to his old joint supplement. This has everything I was looking for and was pelleted (he somehow manages to leave powders in his feed dish). After a week I noticed a bit of difference and really started to notice after two weeks because his joints no longer "popped". It's a little more expensive than I was hoping to find, but it works.
    Date published: 2012-08-19
    Rated 5 out of 5 by from Senior Flex H/A Pellets I highly recommend this product for older horses. I have a 24 year old 3/4 Arabian and he acts like he is 4 years old! It's great to see him out in the pasture with my other horses, running and bucking like a 4 year old!
    Date published: 2012-04-09
    Rated 5 out of 5 by from Senior Flex H/A Pellets Awesome results on a mare from a old injury,Great
    Date published: 2011-12-17
    Rated 5 out of 5 by from such an improvement! After bringing Lacey home April of 2010, knowing she was lame, with some signs of early navicular syndrome, and a left hip joint problem that caused not only her gait to be short strided but restricted her upward movement for simple hoof cleaning or farrier work. This handicap had been such a long term thing it actually caused her frog to be set to the inside of her hoof rather than center and the left hind smaller from lack of use. After one farrier visit I put her on Senior Flex h/a pellets. Just expecting her to get around better. Amazingly over the continual use, she has become a much better horse on many levels. She is nicer to deal with because she is not in pain, she can now be ridden without concern of injury. the combination of farrier work and the smartpak her hoof has changed dramatically with the frog being in its natural position., because she uses the leg again! She can actually run in the pasture, which seems simple enough but requires the use of 4 legs, before she was lagging behind running on 3 legs. Like a tripod!I could go on & on.. the convenience of the Smartpak with the continued use the Seniorflex H/A has made such an improvement. Thank you! Renee
    Date published: 2011-11-30
    Rated 5 out of 5 by from senior flex H/A has worked very well on my 20 yr ex thoroughbred racer she has gained weight and loves the pellets could not be happier.
    Date published: 2011-11-29
    Rated 5 out of 5 by from very impressed I switched my 18 year old 4th level dressage horse from the most Vet recommended joint suppliment to Senior Flex H/A Pellets and he has never felt better, and he easts it with no issues, he is very picky eater. I no longer have to add water or try to hide his suppliment in order to get him to eat it. Thank you MVP. P.S. I switched my horse to this product because I completed the Smarpack questionnaire and this is what was recommended based on my answers.
    Date published: 2011-10-19
    Rated 5 out of 5 by from Great Product My 23 y/o mare was moving freely and was comfortable after one week's dosage. She had been very "creaky" before and just wasn't herself. I like the pellets too, much more efficient than the powder.
    Date published: 2011-07-12
    Rated 5 out of 5 by from A good choice My retired, 31 year old, arthritic long distance competitive trail horse is the most comfortable and mobile on the Senior Flex H/A pellets. Whenever I take them away and use bute or other palliatives, he suffers side effects or no effect. This horse was exceedingly tough in his younger years, so when he manifests pain, it is real. Senior Flex has proven the best choice to allow him a measure of peace of body and mind in his waning time before the end of the trail.
    Date published: 2011-07-12
    Rated 5 out of 5 by from My horse is feeling GOOD! My horse is about 30 years old. When I bought him, he was malnourished. Since then, I have added some supplements to his diet. The Senior Flex H/A Pellets seemed appropriate for the problems my senior horse was experiencing, lameness, lethargy, sway back, tripping, falling, and depression. However, he is running through the arena now, and actually bucking, something I have never seen him do before. It's like he is saying, "I feel GOOD!"
    Date published: 2011-06-24
    Rated 5 out of 5 by from Anther Happy Ending My half-arab is 23 years old. While very athletic, she's showing her age. The barn manager recommended a supplement so I used the Supplement Wizard. In less than three weeks there's a noticeable difference. She's spit out or eaten around most other supplements. She eats this one and I'm looking forward to ongoing improvement. Old mares still rule!
    Date published: 2011-06-23
    Rated 5 out of 5 by from My horse did a 180 I bought a semi-rescue horse. She was 15 year old TB off the track and then an eventer/jumper. She had some old injuries that no one took care of. She didn't show any signs of lameness just irritation. She just acted like a dead head riding and in the pasture. After being on it for almost 4 months now she is a totally different horse. She almost never wants to stand around or not be worked. She could go all day now. Buck and runs in the pasture like she 5. Helped her coat, weight gain, movement. Now im thinking about showing her she looks so good!!!! I love this!!!!1
    Date published: 2011-02-27
    Rated 5 out of 5 by from
    Date published: 2011-02-24
    Rated 4 out of 5 by from great product I have a senoir QH gelding who is a very picky eater. I have tried other joint supplements that he has refused to eat. These pellets seem to be the product for him. Not only is he eating them, he also seems to be more comfortable. He tolerated the farrier's recent visit much better than he has in the past. He doesn't appear to be as stiff and is moving better.
    Date published: 2011-02-21
    Rated 5 out of 5 by from Tasty crunchy I've been feeding my 16 y.o. Andalusian Senior Flex in Smart Packs, but now that he is not at a boarding barn, I switched to bulk Senior Flex pellets. He loves them! He's an easy keeper and gets no grain, so I was feeding a handful of timothy pellets so he's eat his supplements. With the Senior Flex pellets, he chows right down, no timothy needed!
    Date published: 2011-02-21
    Rated 5 out of 5 by from Definitely noticed a difference in our older horse. He thinks and acts like he is 5 years old again. Product has made a difference in him. He feels better!
    Date published: 2011-02-02
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