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Best-Flex HA®

The world’s best equine joint supplement - read the reviews!

1099 reviews. 4.9 / 5
Bryony - 21/02/2024 17:39
I give this to both my 17 year old hardworking warmblood who is feeling fantastic and hasn't had a day's lameness. I also give them to my 6 year old warmblood who is a heavier type as feel it helps in a preventative way.
Guest - 21/02/2024 15:26
Appears to help my horses.
Guest - 21/02/2024 14:45
Great product, great service, fast delivery!!!
Maggie - 14/02/2024 15:41
Best flex has literally saved my elderly cobs life. He has arthritis and had been treated with Bute by his previous owner, however this lead to gastric problems for him. My vet suggested I try supplements to help him and after a little research I found Best Flex which contains many natural ingredients including Glucosamine and MSN as well as natural anti inflammatories I tried this and realised my horse seemed more comfortable. I give him a maintainance dose most of the year and increase this in cold weather. I can honestly say I’m delighted with how much this has improved his mobility and quality of life.
Guest - 14/02/2024 14:28
This keeps my oldies moving.
Nicki - 14/02/2024 13:03
Horse won’t touch it despite introducing slowly
Guest - 07/02/2024 19:33
The first time I have added Best-Flex HA to their regime and both my horses have improved despite only being on the product for 3 weeks so far.  My farrier has been this morning and commented on the difference in the flexibility of my old horse`s hind legs which had been stiff and he was difficult the last time he came.  My dressage horse is not only happier and freer in his movement but his coat has improved and is extremely shiny.  He looks the picture of health and is full of energy.  Although expensive I don`t think I can afford not to continue with this product because of the difference it has made to my horses and I believe as they have only been on it a short while, there will be even more noticeable improvements as it embeds into their systems.  Thank you.
Lisa - 05/02/2024 12:58
Bought this in error, as had previously bought the Extra-Flex. However, our old pony loves it and its really helping him. He's 32 years young and suffers from arthritis, and can be a bit of a fussy eater. He already has the Clarity daily
Rachel - 01/02/2024 09:21
Have used best flex for many years,helps to keep my horse’s joints mobile,less stiff and he enjoys his life. Wouldn’t be without it!
Thank you feedmark😀
Guest - 31/01/2024 19:57
Great for all horses of all ages and types

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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