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Best-Flex HA®

Probably the world’s best joint supplement.

1068 reviews. 4.9 / 5
Jane - 29/11/2023 17:11
It does what it says  brilliant
Guest - 29/11/2023 13:44
Early days but it’s palatable and I’m hopeful that it’s starting to have a beneficial effect.
Guest - 22/11/2023 17:11
Since feeding Best Flex HA I’ve found that my horse seems to be more comfortable and supple.  I’ve also recommended to friends.
Sandra - 22/11/2023 13:16
I have been using Best Flex for my horse since had a torn stifle cartilage three and half years ago. The injury was quite bad and my vet said he may not be able to be ridden again. I started him on Best Flex and I am sure this contributed to his healing so that he could be ridden again. I highly recommend this product.
Karen - 17/11/2023 20:25
Wonderful product - once loaded and on full dose saw an improvement in around 3 weeks
Heather - 15/11/2023 13:40
Really helps my arthritic horse, have been using successfully for 5 years now.
Deborah - 15/11/2023 13:05
Both my horses are benefiting from having Best Flex I have definitely seen a difference in them both.
Jane - 08/11/2023 15:20
Best product on the market
Guest - 06/11/2023 12:32
Have tried others, but  best flex really does seem to make a difference and I am a bit sceptical about supplements!
Lucy - 01/11/2023 19:18
My mare is 23 and still out eventing up to 1m - I am not big on supplements but this is one that I feel she deserves

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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 17000 mg
Chondroitin sulphate 6500 mg
MSM (Methyl sulphonyl methane) 17000 mg
Hyaluronic acid (Sodium hyaluronate) 1100 mg
Vitamin C 11000 mg
Omega-3 fatty acids 7000 mg
Boswellia  12000 mg




Micronised linseed, Glucosamine HCl (vegetarian), Methyl sulphonyl methane (MSM), Boswellia, Chondroitin sulphate (90%, low molecular weight), Linseed oil, 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 level (50ml) scoop of Best-Flex HA® weighs approximately 30g.
A 2.7kg tub fed at 3 scoops (90g) per day will last approximately 30 days.

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