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NAF, Nutritional Advanced Formulas for horses and ponies
Supports the mare's natural oestrus cycle by encouraging regularity and balance
Supports the mare's natural oestrus cycle by encouraging regularity and balance
Supports the mare's natural oestrus cycle by encouraging regularity and balance


Oestress Powder compliments the mare's natural oestrus cycle by encouraging regularity and providing extracts of herbal ingredients that have been used for hundreds of years to support hormone balance. So by improving her diet with Oestress, you are helping your mare to help herself. Oestress also provides bio-available magnesium to relax muscle tension and encourage calmness. Lastly, Oestress is rich in natural antioxidants to naturally support a healthy system. Oestress should be fed daily throughout the spring and summer season and may be increased in accordance with her oestrus cycle. However, if needed Oestress is suitable for year round use.

Chastetree berries, Cramp bark, Magnesium oxide, Black cohosh (root, ground), Withania, Carrot (dried), Sunflower seed, Cynanchum, Immortality herb, Calcium carbonate, Rosehip shells, Skullcap, Omicha berries, Mushroom (dried), Dried algae (Chlorella sp), Ginger root, Liquorice root, Turmeric, Rapeseed oil (refined), Cane molasses, Lignocellulose, Wheat feed, Glycerine, Maize cobs.
Analytical Constituents
Crude Ash 23.70%
Crude Protein 6.15%
Crude Fat 9.44%
Crude fibre 19.60%
Acid Insoluble Ash 4.73%
Sodium 0.06%
For use where behavioural changes and tension are seen in mares which can affect temperament and performance.

Introduce gradually for fussy feeders. Loading rate may be used initially and during peak times of her season.

Also suitable for colts and geldings showing ‘riggy’ or stallion like behaviour.

Not recommended for pregnant mares and discontinue use on brood mares two months prior to covering. Maintenance levels may be adjusted to suit the individual and are not necessarily related to bodyweight. Also suitable for colts and geldings showing ‘riggy’ or stallion like behaviour. Not recommended for pregnant mares and discontinue use on brood mares two months prior to covering.
Horses & Ponies g per day scoops per day
Loading rate (7-10 days) 30 3
Standard Maintenance 10-20 1-2

Jodie Stafford-Searle & Shania

“Oestress is fabulous! I feed it every year during the spring/summer period and it really does make a huge difference to Shania. She is so much more focused and manageable to ride.”


Megan Jenkins & Layla

“My mare used to get very uncomfortable while in season and she would become stressy in her stable. We tried her on NAF Five Star Oestress and it worked so quickly, she was like a new pony, very content and happy. We also use NAF Five Star Magic calmer on a maintenance dose in winter because she can get a bit fiery. It gives my mum peace of mind and allows me to hack on my own because Layla used to be a very anxious pony. Thank you NAF!”


Michelle & Penny

“Penny is a seven year old mare who lives in a small herd of geldings and I find her behaviour during her seasons to be most undesirable. I was recommended NAF Five Star Oestress and after only a few weeks I noticed a big difference. I have been using it for over a year now and Penny is much happier, calmer and content with a positive attitude towards her work. I highly recommend this product!”


Isabel & Heidi

"We recommend Five Star Oestress to everyone as it has honestly made such a difference to our moody mare!"


Gemma Shanks & Freya

"Oestress has been fantastic for Freya! She becomes very anxious in the stable and gets quite uncomfortable in her lumbar region when in season. Since using Oestress she is a lot more comfortable and less anxious. I feel it gives her that extra support she needs during the time she feels uncomfortable......if you could make a human version that would be great and I would be first in line to buy it! She really is a different horse on Oestress! She is now on Superflex having seen how well the Oestress works!"


Amy Miller & Grace Oestress

"Myself & Grace wouldn't be where we are today without the help of NAF Oestress. Prior to starting Grace on Oestress, she was such an anxious mare, proving very difficult to train, but after a month on Oestress she was a changed mare! NAF Oestress is now our daily ritual!"


Jess Atkinson & Toffee

"I absolutely adore the Oestress that I have used for my mare! Me and Toffee had a very sticky start due to her marish nature, however we started using Oestress which completely saved us! She is now the sweetest pony you would meet, so relaxed and not seasonal thanks to Oestress!"


Stephanie Swadden & Miranda (Pink Solitaire)

"I use Oestress for Miranda on a daily basis and notice a difference if she does not have it. I find she is less grumpy and I am not so black and blue with bruises, she is also happier to ride and easier to handle."


Lucy Haw & Cotmullion Enfys

"My horse has always struggled since a young age when in season. She would be hard to handle, very defensive with other horses coming close to her but since being on Oestress she is an angel and I would highly recommend to others."


Annie O'Neill & Missy

"When I first got Missy she was young and as she got older, as mares do, she got more hormonal and I found it difficult to keep up with her mood swings! After lots of supplements we found the perfect one, NAF Oestress, I have never looked back! Thank you NAF!"


Mandy Longthorp & Chanel

"Chanel has just turned 8, I've had her from being a yearling. She has just had the worst season I've ever known - she was dangerous to ride, rearing, bucking, so stressed. I was recommended Oestress and took advice from my vet, after 2 weeks i have my girl back."


Sarah Bunce & Lottie

"After having 2 years of what seemed to be an endless cycle and a very 'flirty' mare, I decided to try Oestress. I was sceptical, I will admit, but WOW, she is so much calmer and I am keeping her on a continued dose."


Eva Mawby & Pandora

I have been feeding Oestress to my mare Pandora as she gets very sharp when she's in season. It has helped her no end and now I swear by it as it keeps her in top form regardless of whether she's in season or not. I barely notice when she comes into season now; she's not only more relaxed but she's much easier to handle and is a lot less stressed. She used to get very attached to all other horses and could never be left on her own without starting to box walk and worked up. Now she is more than happy to stand by herself. #Oestress #Forallseasons


Jean Langrish

I use Oestress all year round for my mare, it’s made a huge difference to her. Knowing she’s comfortable gives me peace of mind.


Chloe Jones & Rosie

"This is me showjumping my little mare Rosie. She is fed on Oestress & GastriAid and is looking and feeling amazing. Thank you NAF!"


Maxine Lowrie & Ginger

Since feeding Oestress Ginger is so much happier and less ‘stressy’ and the tension is hugely improved. Oestress has been a real tonic, can’t believe the difference. Photo Copyright: Mark Beaumont


Michelle Bates

"Oestress has really helped my mare who has had some particularly strong seasons this year."


Helena Troughton & Holly

"Our gorgeous mare Holly has really benefitted from Oestress, we saw a difference in just 48 hours!! We wouldn’t be without it now and recommend it to everyone, it's an amazing product."


Alex Mobbs & Lola

"Lola has been utterly transformed with the help of this game-changing supplement!"


Bethany Moxam & Smartie

"We use Oestress with Smartie all of the time now! We've found that this year she's much more consistent and less stressed when she's on it."


Hayley Marie Jones & Zara

"I love Oestress and would never be without it; because of that it’s a permanent fixture in our feed room which we recommend to everyone with mare with any hormonal issues. Zara loves Oestress because it means she can feel like herself all year round but more than that, Oestress is a product that works and understands the complexities of a great mare."


Minnie & Angel

"I feed Oestress to Angel because I find it has really helped her hormones and how she acts when she is in season. She would try to bite you whenever you went near her but since she has been on Oestress she hasn’t tried to bite me once. She is a lot happier in herself."


Chloe Shannen & Rosie

"I absolutely love Oestress, it makes Rosie so much more manageable and it takes away a lot of stress from both of us so that we can concentrate on the fun stuff."


Liz Husband & Dancer

Dancer is skewbald but with all the attributes of a chestnut mare! Thankfully NAF Oestress keeps her in check.


Rachel Handley-Greaves & Bee

Bee is the boss but her grumpiness has gone now when in season thanks to NAF Oestress.


Carla Danby & Fern

“Oestress has settled Fern’s seasons and temperament down so much, she's a much happier girlie.”


Charlotte & Seren Challenge

NAF Oestress has changed my mare for the better! She is so much more comfortable in herself and rideable during her seasons. It has really helped us both keep training without all the mareish behaviour. She was so unhappy during her seasons, sometimes she would refuse to move! Now we have none of that behaviour. I would 100% recommend Oestress to anyone with a mare showing even just slight discomfort during her seasons - it has been a godsend for us.


Claire Tuff

When we first set out we would be more cautious of owning mares. However, over the years we have grown to favour them. NAF Oestress has helped keep them on top form and easier to handle around the stables. We highly recommend it for both maintenance and to help with peak hormonal cycles.


Nicole Mills & Primitive Origin

We use an awful lot of the NAF products, they are great!! We have a yard of up to 18 horses ranging from homebred foals to 4* international event horses. We’ve been using NAF Oestress for our mares for nearly two years now and highly recommend the product. I first decided to try NAF Oestress on my homebred novice event mare to help keep her level throughout the event season. She’s an incredibly tough little horse who only shows mareish tendencies when travelling, however I wanted to make sure she was feeling on top form no matter what stage of her season she was going through. As a matter of course I decided to put the other mares on the yard on this product and it’s something we use all year round.


Tom McEwen

NAF Oestress plays a fundamental role in the performance and training of my mares on the yard. I find it helps them relax and focus on the job in hand. You really can’t beat a good mare for competition.


Nicky Latham & Thyne Gale

Thyne Gale is a typical thoroughbred mare and NAF Oestress keeps her very level and non stressy, I couldn’t be without it. She is an all-rounder who mainly events and Oestress definitely makes the difference.


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