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SmartFlex® Senior Powder
SmartSupplements by SmartPak — Item #14665
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Best-selling senior formula

  • 7,000 mg of glucosamine, 500 mg of chondroitin sulfate & 50 mg of HA for healthy joints
  • 1,750 mg of devil's claw, 500 mg of boswellia & 300 mg of phenylalanine help manage discomfort
SmartFlex Senior was designed to support older horses in the three areas they need it most – joint health, digestive function, and antioxidants for a healthy immune system.

For joint support, SmartFlex Senior provides 7,000 mg of glucosamine, 500 mg of chondroitin sulfate, 50 mg hyaluronic acid, and 12,000 mg of MSM. This formula contains the herbs devil’s claw and boswellia, as well as the amino acid phenylalanine, to help manage discomfort. To support healthy digestion, SmartFlex Senior provides probiotics, prebiotics, and enzymes. And because senior horses benefit from extra antioxidants, this formula also contains vitamin C and super oxide dismutase. This outstanding formula is a customer favorite!

For even more comprehensive senior support, consider our multi-purpose formula SmartCombo Senior.

View our Joint Supplement Comparison Chart

Find your horse's SmartFlex


Active Ingredients per 30 g:
(Maintenance Dose = 1 scoop (30 g) daily)
  • Methylsulfonylmethane (MSM)
    12,000 mg
  • Glucosamine HCl (shellfish)
    7,000 mg
  • Devil's Claw Extract
    1,750 mg
  • Chondroitin Sulfate (bovine)
    500 mg
  • Boswellia Extract
    500 mg
  • DL-Phenylalanine
    300 mg
  • Calcium Ascorbate (Vitamin C)
    275 mg
  • Fructooligosaccharides
    225 mg
  • Super Oxide Dismutase (bovine)
    100 mg
  • Sodium Hyaluronate
    50 mg
  • Pancreatin 8x (supplying Amylase, Protease, Lipase)
    30 mg
  • Profloratin® (a proprietary blend of L. acidophilus, L. casei, E. faecium and B. longum)
    4.7 billion CFU
Inactive Ingredients: : Cherry Flavoring, Magnesium Silicate.


Instructions for Use:
Horse Weight Recommended Amount
Under 500 lbs. 0.5 scoops
500 – 1000 lbs. 1 scoop
1000 – 1500 lbs. 1 scoop
Over 1500 lbs. 1.5 scoops
Directions for Use: Administer 30 g daily, 1 scoop = 30 g.

Clinical Research

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    90% 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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    SmartFlex® Senior Powder is rated 4.6 out of 5 by 650.
    Rated 4 out of 5 by from Good results so far! Seems to be helping 30++ year old mule. She seems less stiff.
    Date published: 2014-10-21
    Rated 4 out of 5 by from Good for Seniors Smuggler has been on this supplement for about 4 weeks now. Can't say I've seen an improvement-but I've definitely not seen him get any worse. He's 22 and can still carry me up and down a mountain for 6 miles with no problems.
    Date published: 2014-08-12
    Rated 5 out of 5 by from Works Great! My 29 yrs old mare has been on a while and it has made such a difference!
    Date published: 2014-07-16
    Rated 5 out of 5 by from Easy to Pick Out Hoof My Thoroughbred kept flexing his leg each time I tried to pick out his hind hoof. It became annoying and he was getting upset. Rather than getting a side kick, I realized I needed to help him get more comfortable. I have used SmartFlex for a month now, but within 2 weeks he was obviously more comfortable and we are both much happier. A product that definitely works!
    Date published: 2014-06-04
    Rated 4 out of 5 by from We all need joint supplements My 17 year old mare is very sound but I felt at her age and activity that I wanted to raise her level of joint supplementation, she was previously on the maintenance formula. She is moving very well and though has never seemed uncomfortable, now seems more curious and more willing to do what I ask!
    Date published: 2014-05-02
    Rated 5 out of 5 by from great product My dashy bay is moving like he is young horse again. He is not as stiff in the knees as he use to be.
    Date published: 2014-04-29
    Rated 5 out of 5 by from Friskey Horse I have been using this supplement for several months and my 28 year old Arab runs everywhere these days. He is always either trotting or cantering around, which a year ago was not happening. The only thing that has changed is that he now gets this supplement. He does not have the best conformation, so I think his joints may have some arthritis in them, especially his shoulders and feet. I think the combination of MSM and other ingredients may be easing some of his joint aches and he is doing much better.
    Date published: 2014-04-07
    Rated 5 out of 5 by from improved flexiability My gelding is a ottb rescue my chiropractor suspected he had swelling in his neck due to his treatment before he was rescued. He used to tilt his head when warming up. Since being on this he no longer does he also is moving much better all the time. Thanks Smartpak
    Date published: 2014-02-11
    Rated 5 out of 5 by from Great product Great service and my 30 year oldQuarter horse takes it readily in his feed. Appears to be helping his digestive system.
    Date published: 2014-01-20
    Rated 5 out of 5 by from Good product My horse has been on this for years...he's 26 and you would never know it. He's never had any obvious joint pain or problems and moves without any issue at all...and that's being ridden several times a week. I trust smartpaks products and have no doubt that smartflex senior has had a major impact in my horses quality of life. My horse is a pretty picky eater and he usually eats this in his grain without leaving much.
    Date published: 2014-01-08
    Rated 2 out of 5 by from easy packs. Horse hated the powder. Wouldnt finish her feed.  and when i opened the box, one of the packs wasn't sealed. Powder all over the floor and sectional.  
    Date published: 2013-12-17
    Rated 5 out of 5 by from Great product I bought this a month ago , and I am confident that it has everything my 17yr old TBrequires as he is looking great.
    Date published: 2013-12-09
    Rated 5 out of 5 by from Gelding is happy and healthy! I started my 18 year old Rodeo quarter horse on this product back in January. Due to chasing cans and cows I wanted something that would help support his joints and other areas of his aging body. It seems to be working! He hasn't had any days of soreness and stiffness and I saw an improvement in his digestive health and also his weight management because he wasn't always an easy keeper. He acts like hes 5! No one ever believes me when I tell them his age. He is also on smart-breathe for his allergy season and I switch between smart-bug off and smart shine for his coat. I want to keep my boy around for a long time and I believe smartpaks is helping me do just that!
    Date published: 2013-11-22
    Rated 5 out of 5 by from
    Date published: 2013-10-02
    Rated 4 out of 5 by from Great Supplement The Smartpak senior formula has helped my 25 Morgan gelding stay "young" for the past 5 years. He eats the powder formula easily and hasn't had a step out of place in years!
    Date published: 2013-08-29
    Rated 4 out of 5 by from joint supplement I have 2 horses on this supplement. I started them both as a preventive measure. One has diagnosed navicular and low ring bone. I recently started hearing the one with navicular and ring bones joints start cracking. He is 21 years old and hasn't been lame since his first injections last fall. My other guy seems to be doing fine. I still have them both on the supplement, but I'm not sure if it is working or not. I've had them on it for over a year now. Not planning to take them off because it is too easy to use and I believe it must be doing something. Better than nothing.
    Date published: 2013-08-28
    Rated 5 out of 5 by from Senior Boost Smart Flex Senior works well for my horse - she is 19 yrs. old and moves better with this supplement.
    Date published: 2013-08-21
    Rated 5 out of 5 by from My old girl looks good A year and a half ago, I wasn't sure my Paint mare that I raised from a foal (daughter of my first horse) would still be around at this time. She was 27 years old and was so stiff with arthritis I was afraid the time was coming to let her go. Also, we couldn't get any weight on her no matter how much we fed (and she often didn't finish her grain).I put her on Smartflex Senior and she finally put on a little weight. At the same time we loaded her up on Adequan and continued using it for about 6 months consistently, so I can't say for sure her improvement in the lameness is all from the Smartflex, but this year she looks better than she has in several years as far as her coat, weight and getting around the pasture. We haven't needed the Adequan during warm weather, but will probably start it up again in the winter. I attribute most of her improvement in health to the Smartflex Senior. Looks like she'll probably make it to 30 after all.
    Date published: 2013-08-21
    Rated 5 out of 5 by from Perfect for old man. My senior horse has been on this for 8 years and I can't ever imagine him not having it. It was the very first supplement I put him on and the difference it has made in his life is significant. He has advanced arthritis in both knees and hips but still wanders around without pain or joint stiffness. I've even caught him running the fence lines with the young horses in the next pasture. I will continue to use this product with all my senior horses.
    Date published: 2013-08-20
    Rated 4 out of 5 by from Maintain suppleness It has helped my 20 year old quarter horse to stay sound and enjoy summer.
    Date published: 2013-08-18
    Rated 5 out of 5 by from Saved my mare's LIFE!!! I had gotten a rescue horse, Terra, about three years ago and she was about 20. For two years she was 98% sound, with slight popping in her hocks. She was amazing in the hunter/jumper ring at the 2'6" as well as being shown on a competitive drill team and in the sorting pen. Last October, she was supposed to go to a show to compete in the 2'6" hunter ring as well as the week after with a student when the day before she went LAME! Dead lame walking on two legs. We tried EVERYTHING! The vet and my farrier was stumped. We were about to put her down, not wanting her to suffer when as a last resort I decided to put her on Smartflex Senior. She inhaled it and within the first week I saw a difference! Being on it for three months, she is BACK AND SOUND!!! She is cruising around at home over 2'3" jumps dragging me to them because she feels so good, and has even gone sorting a few times with a student and nearly won a buckle!!! Better yet, no more popping! Terra now has a long life ahead of her teaching many more kids how to ride and respect horses.Thank you Smartpak for saving my horses LIFE!
    Date published: 2013-08-01
    Rated 5 out of 5 by from Good for my picky eater My horse was on the pelleted version of this supplement along with two others. After she broke a tooth, she started leaving the supplements in her feed bin. Switched to the powder version, and now she eats it all up! Thanks!!
    Date published: 2013-07-29
    Rated 4 out of 5 by from Best Value for a Budget While the I like the SmartFlex products with 100mg of HA the best, my budget doesn't always allow for my 23yo TB (dressage/eventing) to have them each month. The SmartFlex Senior is an excellent value for leaner months. It noticeably maintains his joint health and comfort level. He works 3-4 times weekly, his gaits have maintained their integrity. There is a distinct difference as compared to when he is not on any joint supplement.
    Date published: 2013-07-23
    Rated 5 out of 5 by from Best Senior Horse Maintenance I have tried many brands of joint supplements for my horses over the 13 years I have owned them; spending as much as $150 for a 2lb. bucket. Unfortunately my PercheronXAppy that REALY needed it passed away 3yrs ago at the age of 29 before I found a supplement that really worked for him, but because of the lack of preventative care he received for his joints before I purchased him I know that they do really need it. I have a 25yo Arabian gelding that has never shown signs of lameness or stiffness and he still acts as he did when I rescued him 11yrs ago. One thing that I have learned from owning many senior horses is that something that works for one horse doesn’t always work for another. The supplement that worked okay for my Percheron cross did not work at all for my Arabian, so he has spent allot of time on and off of different joint supplements. When I found Smart Flex Senior and started my horse on it I didn’t notice a difference because he is semi retired now and doesn’t get ridden much, until I talked to a neighbor that loves to sit on her porch and watch them in the field, she told me that he has started playing and running around with my 3yo Arab gelding and he now RUNS up the hill to the barn at feeding time instead of walk as he has for the past 11yrs I have owned him.
    Date published: 2013-07-22
    Rated 4 out of 5 by from Giving to a 13 year old halflinger that is ridden approximately 8 to 10 hours weekly on very hilly and uneven terrain. Noticed an improvement within 8 days. My horse is still slightly sore but a definite improvement and will continue using.
    Date published: 2013-07-15
    Rated 5 out of 5 by from Results in Two Weeks! My 20 year old New Forest Pony wasn't showing any signs of being stiff or sore, but would have an occasional "pop" from the hock when cantering. As a preventive measure, I wanted to start him on a joint supplement before he really needed one. After just two weeks, he was really wanting to go! All he wants to do now is canter. My two other riders also commented about how feisty and good he was feeling. Plus, he loves it! I'll admit to tasting it, just because its smells so sweet. Keeper is a really happy pony!
    Date published: 2013-05-15
    Rated 5 out of 5 by from great product started my horse on this about 8 weeks ago, seems to be improving his joints overall, he seems more comfortable. Price is affordable and product is great!
    Date published: 2013-05-11
    Rated 5 out of 5 by from Gap Help I had added this product to my smart pak, however I was at the beginning of a cycle and needed something to fill the gap between now and the new smart pak. The customer service rep was very helpful in "filling the gap". It worked perfectly -the canister ran out just as the new monthly smart pak kicked in - Thanks again
    Date published: 2013-05-10
    Rated 4 out of 5 by from Preventative Measure I have a 27 YO Arab with 27 YO teeth and he has no problems eating this supplement and no palatability problems. I have not noticed a difference in his behavior or performance, but because of his age I want him on a supplement to prevent problems. The level and type of ingredients also are what I was looking for in a senior supplement. Smart Pak Senior seems to be priced similarly to other products and I know they have good products, which is why I scored them a 4 on everything.
    Date published: 2013-05-01
    Rated 5 out of 5 by from smartpak senior i have a 23 yr. old draft qh and before smart pak he was very sluggish and sore. now hes very active and his coat it is shiney what a difference people cannot believe hes 23. i really wanted to see if it was the supplements so i took him off them for a few weeks and he didnt even want to do his workout. thank you smartpak what a difference it made.
    Date published: 2013-04-13
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