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Best-Flex HA®

Probably the world’s best horse joint supplement - read the reviews!

1262 reviews. 4.9 / 5
Guest - 16/07/2024 21:56
Always a great service with top quality products
Guest - 16/07/2024 20:28
Very pleased with the product. The ingredients are clear and straight forward to workout and compare against other brands.  For a joint supplement this is clearly the winner and by far superior to other big brands whose marketing is misleading in what the horse would get on a daily basis. Read the small print. Best-Flex stands out and high quality product - highly recommend it for any horse.
Guest - 16/07/2024 14:30
Excellent product.

Used on 2 event mares. 16 and 15 yrs old.
Guest - 16/07/2024 04:59
I am new to the product .I have only been using it a month. However, I have heard very good reviews about it
Guest - 15/07/2024 21:24
It has help me maintain healthy joints in my horse for the last two years.
Guest - 15/07/2024 21:00
Very successful product helping my 22 year old mini shetland to move more freely with his arthritic joint. Also using it with trust on my 29 year old thoroughbred that I want to remain sound.
Guest - 15/07/2024 20:37
I was recommended this product a few years ago and it has certainly helped our aging pony stay flexible and supple.
Guest - 15/07/2024 20:23
Fantastic joint supplement, wouldn’t use anything else - has made a huge difference to our horse with arthritis.

Always quick delivery and brilliant customer service from the feedmark team.
Guest - 15/07/2024 20:13
Great product promptly delivered ! What’s not to like ?
Guest - 15/07/2024 20:09
My horse is a 15 year old hunt veteran and before using Best Flex HA, regularly tripped and was stiff after periods of stabling and minimal movement. Best Flex HA has made an undeniable different to his mobility, and range of movement, ensuring he is best supported for his career change from the hunt field to the dressage arena. Wouldn’t not use it!

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Nutrition Information

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 hydrochloride (HCl), Chondroitin sulphate, Hyaluronic acid (HA) and Methyl sulphonyl methane (MSM) are the well researched ingredients proven to provide significant results. Additional helpful joint nutrients include soothing foods such as Boswellia and those rich in Omega-3 polyunsaturated fatty acids. Vitamin C is included for its antioxidant properties that help to neutralise free radicals. 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 of time 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.

In line with our promise to always provide the best possible products, we source the finest quality Boswellia we can from suppliers aligning to the same strict feed assurance schemes as ourselves and with the highest possible levels of Boswellic acid. 


Micronutrient Analysis


Active Ingredients                                                            Per 3 scoops:                                                
Glucosamine HCl 18000 mg
Chondroitin sulphate 6500 mg
MSM (Methyl sulphonyl methane) 18000 mg
Hyaluronic acid (Sodium hyaluronate) 1100 mg
Vitamin C 11000 mg
Omega-3 fatty acids 11000 mg
Boswellia  12000 mg




Micronised linseed, Glucosamine HCl (vegetarian), Methyl sulphonyl methane (MSM), Boswellia, Linseed oil, Chondroitin sulphate (90%, low molecular weight), Sodium hyaluronate (HA).


Vitamins Additive number  per kg
Ascorbic acid 3a300 122g


Moisture 21.5%
Crude protein 14.0%
Crude oils & fats 14.8%
Crude fibre 5.6%
Crude ash 2.2%
Sodium  0.5%

*Based on publicised maintenance rates for active ingredients for a 500kg horse. Correct at time of release. 

Feeding Guide


Body weight  Amount per day
Up to 250kg 1 Scoops
250kg - 400kg 2 Scoops
400kg - 600kg 3 Scoops
Over 600kg 4 Scoops

1 scoop (50ml) of Best-Flex HA® weighs approximately 35g.

Feed the recommended level, or as recommended by your veterinary surgeon.

The daily feeding rate can be adjusted based on your horse’s work load, age and mobility, to suit their long term daily requirements. Before and during a period of hard exercise, the daily levels can be increased to the next scoop level to provide extra joint support and may be continued on a long term basis for superior joint health support.


Best-Flex HA® is a complementary feeding stuff for equine animals. Feedmark uses nothing in the formulation of this product that contravenes FEI competition rules.

Learn more about competing within the rules by clicking here