Senior Flex H/A (Pellets)

(11 reviews)

The Original #1 Senior Joint Support Plus H/A!  Senior horse joint support products provide joint support actives (glucosamine, chondroitin, MSM, Yucca, H/A, etc.) to help support healthy joint function and manage discomfort that comes with aging. Ester C and Vitamin E are included for immune support as well as probiotics for digestive function. Senior-Flex H/A is a good choice if your s… Read More

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The Original #1 Senior Joint Support Plus H/A! 

Senior horse joint support products provide joint support actives (glucosamine, chondroitin, MSM, Yucca, H/A, etc.) to help support healthy joint function and manage discomfort that comes with aging. Ester C and Vitamin E are included for immune support as well as probiotics for digestive function.

Senior-Flex H/A is a good choice if your senior horse needs a more advanced level of joint support. Senior Flex H/A has the same ideal formula as the Senior-Flex with a higher level of MSM and Hyaluronic Acid (H/A) for additional support. H/A helps to support healthy cartilage and synovial fluid.



Glucosamine is the building block of chondroitin sulfate, a specific type of polysulfide glycosaminoglycan (GAG), a small but complex molecule that plays an important role in the production and protection of joints. Glucosamine plays multiple roles within joint function and health. It helps increase the production of new GAGs and therefore new cartilage, has also been shown to help inhibit free radicals and enzymes that break down cartilage. 

Hyaluronic Acid (HA) helps support healthy cartilage and joint fluid. Hyaluronic acid is what makes joint fluid "sticky" because it is known to protect cells in the joint, HA is especially useful during periods of high-level joint stress.

MSM: (Methylsulfonylmethane) Assists body to produce its own internal antioxidants which helps support natural inflammatory response by providing protection against oxidative stress. It is a great source of sulfur, which plays an important role in maintaining the health of collagen, cartilage, hooves, hair and joint fluid.

Chondroitin Sulfate works synergistically with glucosamine in the production of new cartilage and inhibits the effects of various enzymes that breakdown cartilage. It also helps to support a natural inflammatory response lending to overall joint health and comfort.

Yucca is an herb native to North and Central America used by ancient and modern civilizations to address musculoskeletal discomfort. Active ingredients have been isolated from Yucca that have shown to have antioxidant properties to help support natural inflammatory response.

Ester-C® (calcium ascorbate) is a unique patented ascorbate complex bound with calcium carbonate. Ester- C® is naturally processed in purified water without the use of alcohol or acetone solvents. This makes Ester-C® a more readily available, readily absorbed form of vitamin C. Vitamin C is an antioxidant that helps protect the tissues of the body and also important in the production of connective tissues like tendons and ligaments. Ester-C® has up to 4X more metabolic activity than standard vitamin C (ascorbic acid).

Vitamin A is well known for its role in supporting healthy vision, immune function, and skin/coat. However, it is also needed for respiratory health, reproduction, soft tissue and normal skeletal development in young growing horses and exercising horses that are remodeling bone.

Vitamin D (Calciferol) plays an indirect role in bone growth and maintenance by managing the levels of calcium (Ca) in the body. It assists in the absorption of Ca from the intestine, the movement of Ca into and out of bone, and the amount of Ca excreted by the kidneys.

Vitamin E is considered the most important antioxidant and works closely with selenium to protect the body from the oxidative stress of exercise and illness. Found in high amounts in fresh pasture, levels begin to decay the moment pasture is cut for hay. That is why any horse that does not have access to grass, regardless of its activity level or health, would be a candidate for vitamin E supplementation. Horses are not very efficient in storing vitamin E and deficiency may be accelerated if the diet is deficient in selenium.

Probiotics are live microorganisms (bacteria and yeast) that help promote healthy digestive function and support a healthy immune system. Often referred to as ‘good bugs’ they help break down ingredients/contents that the body normally can't, and help inhibit ‘bad bugs’ from growing.

I want to start my older gelding on a joint support. What is the difference between the Senior-Flex and the Senior Flex H/A?

MVP: Senior-Flex is a great product to start your senior horse on by providing tried and true joint support ingredients such as glucosamine, chondroitin and MSM. It also provides probiotics for digestive support. Senior-Flex H/A is a good choice if your senior horse needs a more advanced level of joint support. Senior-Flex H/A has the same ideal formula as Senior-Flex with a higher level of MSM and added Hyaluronic Acid for additional support.

At what age is a horse considered a senior??  My 17 yr old quarter horse is not at all stiff or has any signs of discomfort, but a friend has suggested that I should put him on this product before he starts showing any wear and tear. We ride once or twice a week. 

MVP: Although there is no rule regarding when a horse becomes a senior, many horse owners use age 15 as a general guide. Just like in people, horses age differently depending on their physical condition and several other factors. As many senior horses experience stiffness and discomfort associated with aging, it’s a great idea to start your older horse on a supplement now to help support healthy joints.

  • 5

    Posted by Gull Dahl on 21st Nov 2023

    She is almost 29 years old and I noticed she was loosing muscles. Pretty soon after giving her Senior Flex H/A pellets she started to look much better. Thank you Purina

  • 5
    Senior Flex H/A...

    Posted by Holly Clifford on 19th Sep 2023

    I have owned a series of OTTB's over the years and now own a retired reiner. These horses all worked very hard over their former careers and Senior Flex is a crucial element in keeping them sound and comfortable. It is highly palatable and my horses will eat it out of my hand. I highly recommend.

  • 5
    Very Satisfactory results

    Posted by Ginga on 4th Sep 2015

    I first bought this for a young, pregnant mare with a joint injury. I liked the ingredients and the fact it has no Devil’s Claw. The mare did very well throughout the winter. I then began using it on my 18 y.o. OTTB and she stayed happy all winter. She does not do as well when off this supplement. I have since began giving it to another 18 y.o. mare and she is moving better. I have had very satifactory results with this product. None of my horses refuse to eat it. Great product at a reasonable price!

  • 5
    Great joint health product

    Posted by Tracy on 5th Jul 2015

    In March I switched my horses joint support supplement from a daily prepacked companies product to Senior Flex HA. My horse is one of the pickiest eaters I have ever met and he readily eats this supplement. I love the fact that there are probiotics, added vitamins, and great levels of glucosamine, chondroitin, hyaluronic acid, and MSM. Overall, this is a great joint health product!

  • 4
    25yr old still compete competitively

    Posted by Kristen on 2nd Jun 2015

    I have been using this product on my horse for years now and am very pleased with the results. My mare is 25 years old and I still compete competitively on her. Would recommend this product to help maintain older horses

  • 4
    Very happy with this product and will continue

    Posted by Kristy on 12th Sep 2012

    I have used this product in the past, I have tried different products, This product has me coming back, due to price and results I see in my 12 yr old AQHA horses. Im very happy with this product and will continue.

  • 5
    Results have been great and seen within 2 weeks

    Posted by Patti on 24th Apr 2012

    I have used Senior Flex for over a year now. The results have been great and were seen within 2 weeks. My 30 year horse is moving beautifully.

  • 5
    Used for several years with great results

    Posted by Lori on 13th Apr 2012

    I have used Senior Flex for several years now, with great results. I just recently switched to the Senior Flex HA, and I believe that is even better. My 30 year old Arab mare moves more easily, and has more energy. I will definitely stay with this as a supplement!

  • 5
    Continues to excel

    Posted by Becky on 7th Apr 2012

    I love the Senior Flex/HA! It has been a mainstay for our now 21 year old AQHA gelding, Jet Bandito. He just continues to excel, most recently, at a benefit Barrel Race in Huron, SD,March 17th, winning the 12 and under Peewee race by over 3 seconds, then, later in the day, placing 5th in the 1D open out of 140 entries!!! I cannot say enough good about this product and how well my 20 something horses do on it.