welcome to the Feedmark website


Freephone:0800 585525
Welcome to Feedmark
You have no items in your shopping basket.


Feedmark Best-Flex HA® is the highest specification joint supplement you can buy - see the chart below;

This chart compares the milligrams of active ingredients in the recommended daily amount (for a 500kg horse) of each supplement

 Comparison chart...
Omega 3
Vitamin C
Flex Score
 Feedmark Best-Flex HA 17000 6500 17000 1100 12000 7000 11000  *****
Feedmark ExtraFlex HA* 12500 1000 10000 400   4560 150 ****
Aviform Suppleaze Gold 5500 2000 2460 40 - - - *
BettaLife PharmaQuin Equine 4000 1600 4000 100 - - 166 *
Duraflex Elite 3250 1000 1650 50 1550 - - *
Equimins Flexijoint 6095 3000 3615 45 - - 500 **
Equine America Cortaflex HA - - - 15 - - - -
Equine Answers PremierFlexHA 3810 1460 2930 80 - - - *
Healthspan EquiFlex 5000 1000 - - - - 170 *
Hi Form Proflamaid Plus  -  -  -  -  - 2250 -
Horse First My Joints 10000 - - - - - 2500 *
Lintbells YuMove Joint 5000 - - 60 - - 500 *
Maxavita MaxaFlex 6000 - 6000 15 - - - *
NAF 5 Star Senior 7190 78 7190 43 - - - **
NAF 5 Star Superflex 5005 12 5005 12 - - - *
Newmarket Joint Supplement 10000 - - - - - - *
Nutravet Nutraquin+ 2550 1050 - - 375 - 250 *
Protexin Cosequin Equine 2700 900 - - - - - *
RiaFlex Complete HA 6100 2700 6100 53 - - - **
Science Supplements FlexAbility Plus 10000 4100 6500 150 - 2900 5000 ***
Synequin 5000 2000 - - - - 570 *
TopSpec 10:10 Joint Support 10000 - 10000 - - - 1000 ***
Based on publicised maintenance rates shown in milligrams for a 500kg horse correct at time of release. E&OE.*Maintenance rate shown for comparative purposes is optimum. Flex Score is used to give a visual comparison.
For further information please contact Ms. Lauren Harrold BSc.Nutritionist [email protected]
 This graph compares the actual amount of active ingredients you would feed a 500kg horse a day. Please DO NOT confuse this with INCLUSION RATES either in grams or percentages. OBVIOUSLY, IT IS WHAT YOU ARE ACTUALLY FEEDING THAT COUNTS.



The scientific basis of our Best-Flex HA® formulation: It has been shown through multiple scientific studies and published clinical evidence that oral supplementation with joint nutraceuticals can be beneficial in supporting joint function, flexibility and overall suppleness. Glucosamine, chondroitin sulphate, hyaluronic acid (HA) and methylsulphonylmethane (MSM) are the well researched ingredients proven to provide significant results. Additional helpful joint nutrients include antioxidants and soothing foods such as boswellia, vitamin C and those rich in omega 3 polyunsaturated fatty acids. Other manufacturers may choose to include other, sometimes peculiar, ingredients to make their formulation different - these ingredients may not be so well researched or proven and may have consequences if fed above certain rates or on a long term basis. Best-Flex HA® is SAFE to feed at increased levels and for extended periods for horses that may require additional support. Furthermore, Feedmark's CPI policy (Continuous Product Improvement) ensures we are constantly updating our formulations to provide the latest beneficial ingredients based on our experience, research and trials - we have 40 years of excellence in equine nutrition under our belt.

Glucosamine is a well known and widely researched joint health ingredient. It is a small, water soluble molecule and plays a vital role in building cartilage, ligaments and tendons. It also occurs naturally in the fluid around the joints and in bones. Cartilage is the firm, rubbery tissue that pads the ends of bones where it meets a joint. Ageing and general ‘wear and tear’ results in cartilage becoming less flexible and steadily breaking down. Glucosamine is required for the production of glycosaminoglycans (GAGs), the compression-resistant components of cartilage. Two GAGs specific to joint mobility are chondroitin sulphate and hyaluronic acid.

Chondroitin sulphate is found in cartilage and is a key component for cartilage strength and longevity. Rather than being directly absorbed through the intestinal wall, it is thought to enzymatically degrade with studies showing good bioavailability.

Glucosamine and chondroitin sulphate together support cartilage function.

Hyaluronic acid (HA) is a key component of connective tissue and cartilage which aids joint lubrication. It has high shock absorbing properties and although a horse can make HA, it breaks down relatively quickly and as they age, the body produces less. HA supplemented daily can help support joint health and flexibility.

MSM is found in many foods and it is a source of sulphur and necessary for the production of collagen. Collagen is the most abundant protein in horses and is found in tendons, ligaments and cartilage.  MSM has been shown to have antioxidant benefits that make it a helpful joint nutraceutical to support flexibility and elasticity.

Boswellia (Boswellia serrata) is the resin collected from the Boswellia serrata tree. This resin contains boswellic and other organic acids that has been shown to be effective for joint comfort.

Vitamin C is a water soluble vitamin and acts as an antioxidant. It is required for the production of collagen and connective tissue, such as tendons and ligaments Collagen forms part of the extracellular matrix of joint cartilage.

Omega 3 fatty acids, such as those found in a high ratio in linseed, have been shown to have a supportive role in joint health and stiffness. Daily supplementation with omega 3 rich linseed may help with general flexibility and suppleness.


The practical, ongoing trials of our Best-Flex HA® formulation: To our knowledge, Feedmark are the only professional equine nutrition company to be able to trial products on a controlled long term basis and monitor results. We have over 35 horses of different breeds and ages kept at our own facilities under the care of our Equine Director Mrs. Rebecca Townsend BSc. (Hons) MCSP. and her team. Rebecca is a life long equine enthusiast with multi disciplinary experience and as a qualified physiotherapist she is a Member of the Chartered Society of Physiotherapists. She and her equine team are pleased with the results of Best-Flex HA® - "When we feed Best-Flex we not only see short-term benefits but also we believe it helps them to perform for longer. Many of our horses are still working well into their teens and beyond. We all know good horses are hard to find so keeping them healthy and performing for as long as possible is crucial”