Chamomile 1kg bags reduced from £25.49 to £15 per pack.This batch has a best before date of June 2024. 
Introducing four new products -
Tricalcium Citrate with 21% Calcium, is a highly absorbable chelated source of Calcium.Pro Airway Plus has a powerful blend of natural antioxidants, herbs, and vitamins for support of a healthy respiratory and immune system.Beta Glucan is a powerful Equine Immune System support, G.I. Tract Health & Performance Support.Vitamin A D E & K is a source of fat soluble Vitamins for horses.

MAGNESIUM OXIDE 99.7% to 99.8%. High Purity Pharmaceutical grade Magnesium for forage balancing, strong hooves and laminae connection, Equine calmer, metabolic health.


Stock Weight DescriptionPriceQuantity
196 1kgHover your mouse here to view multi-buy discountsClick here to view the multi-buy discounts below. £17.99 -+
94 2kgHover your mouse here to view multi-buy discountsClick here to view the multi-buy discounts below. £33.99 -+
20 4kgHover your mouse here to view multi-buy discountsClick here to view the multi-buy discounts below. £63.99 -+
QuantityDiscountPer Item Price
3+ -£0.30 £17.69
QuantityDiscountPer Item Price
3+ -£0.40 £33.59
QuantityDiscountPer Item Price
3+ -£0.50 £63.49

Magnesium Oxide, actual purity 99.7% to 99.8% MgO.

Please note the actual percentage of Magnesium Oxide MgO varies between 99.7% and 99.8% depending on the batch number of the product in stock. The actual percentage will be written clearly on the bag.

Magnesium Oxide 99.7% to 99.8% is a high purity pharmaceutical grade magnesium. It is a very fine particle size and virtually tasteless making it well accepted in food.

  • Magnesium oxide is the primary ingredient in many of the quality equine calming products on the market.
  • Magnesium is needed for more than 325 enzymes within the horses body.
  • Involved in protein synthesis so needed for general growth and repair of tissue, e.g. Hooves.
    Required for the maintenance of normal blood circulation within the body, limbs and feet of the horse
  • Magnesium is critical for balanced secretion of insulin and glucose uptake.
  • It is involved in supporting correct blood sugar levels after carbohydrate intake and inadequate levels are
    associated with incorrect insulin function  (symptoms include cresty neck and/or fat deposits).
  • Magnesium is essential for proper calcium absorption and is an important mineral in the bone matrix.
    It can also assist in the absorption and metabolism of Vitamins B, C and E.
  • Low levels of Magnesium can result in nervousness and an inability to concentrate, tight tense muscles
    which are less able to relax, tightness or tenderness through the back, slow to warm up.
  • Periods of stress lead to an increased need for magnesium.
  • Magnesium is often lacking in equine diets due to processed, preserved, high concentrated feeds.
  • Magnesium is important for the detoxification of toxic substances from the body. It supports
    against heavy metal toxicity.
  • The availability of magnesium is low in; fast growing lush grass; after periods of rainfall; in
    acid soils i.e. ‘horse sick pastures’ or artificially fertilised pastures (acid conditions destroy soil
    microorganisms which are used to make the minerals usable by plants).
  • Useful when magnesium needs boosting in the diet of horse and ponies prone to laminitis.

Feeding guidelines (Requirement may vary):

2g of Magnesium Oxide 99.7% to 99.8% per 100kg of bodyweight,  (10g of magnesium oxide daily for an average 500kg horse)

1 X 15ml measuring scoop = 10g Magnesium Oxide 99.7% to 99.8% (providing approximately 6g elemental magnesium)
1 X 25ml measuring scoop = 15g Magnesium Oxide 99.7% to 99.8% (providing approximately 9g elemental magnesium)

Typical analysis: MgO – 99.8%, Fe2O3 0.0027%, CaO 0.005%, Cl 0.05%, SO4 0.06%, KO 0.008%.

Pack size and availability: Progressive Earth Magnesium Oxide 99.7% to 99.8% equine feed supplement is available in resealable grip seal pouches containing either 1 Kg, 2 Kg or 4 Kg of product. (Scoop not included).
Multiple purchase options are available.

56 reviews for MAGNESIUM OXIDE 99.7% to 99.8%. High Purity Pharmaceutical grade Magnesium for forage balancing, strong hooves and laminae connection, Equine calmer, metabolic health.

  1. Anonymous (verified owner)

    Great product

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  2. christine rogerson (verified owner)

    Easy to order and delivery was very quick . Love your products

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  3. Anonymous (verified owner)

    We have added magnesium to our mare’s feed during pregnancy and will continue during lactation, to ensure she has the levels required to support the growing foal.

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  4. Catherine (verified owner)

    Good quality no rubbish added. Very good price

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  5. Eveline Guarino (verified owner)

    Very pleased with the MgO
    Horses doing very well on it

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  6. Aylsa R. (verified owner)

    Great product always great quality

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  7. Lisa Rich (verified owner)

    great product

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  8. Tracey (verified owner)

    Good stuff

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  9. Anonymous (verified owner)

    Very easy to order and arrived quickly. Thank you for fredo chocolate. That was a lovely surprise.

    (0) (0)
  10. Allison Barber (verified owner)

    Great service, love the free chocolate bar, such a lovely gesture and great product. Thank you.

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  11. Virginia G. (verified owner)

    Excellent product. I use it to help metabolise the sugars in my horses blood to prevent excessive weight gain. It also works as a calmer. Really good value for money compared to all the expensive products sold online for horses

    (1) (0)
  12. kate b. (verified owner)

    Excellent service, delivery and quality of products. Highly recommended even delivering to France post Brexit

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  13. Allison Barber (verified owner)

    Always great service, very prompt delivery and not forgetting the chocolate bar. Thank you very much.

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  14. Claudia M. (verified owner)

    My two year old is much more calm and his hooves have improved. Thank you

    (1) (0)
  15. Lesley Southam (verified owner)

    Excellent service. Great product

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  16. Sue Dymond (verified owner)

    All good

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  17. Deborah (verified owner)

    Quality product — never lumpy.

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  18. Emma (verified owner)

    This product is the best quality and most cost effective I have found. Progressive Earth products are always accepted by my horses straight away (I have had trouble with other companies products in the past – even when introducing slowly). Great products and company

    (1) (0)
  19. Lesley McDowell (verified owner)

    Very quick delivery

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  20. Bruce Botrel (verified owner)


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  21. Anonymous (verified owner)

    I was looking for a supplement that would help my mare’s mood and her hooves. My mare can be a bit stroppy, so started using this product as an addition to her feed. So far she appears to be a lot calmer and hooves are looking good.

    (1) (0)
  22. Anonymous (verified owner)

    Works well

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  23. Lesley McDowell (verified owner)

    Very good quick service

    (0) (0)
  24. Karen M. (verified owner)

    Always prompt and as described

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  25. Di P. (verified owner)

    Trusted product

    (0) (0)
  26. Amanda (verified owner)

    Well packaged

    (0) (0)
  27. Eveline Guarino (verified owner)

    Very pleased with result on my 8 horses

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  28. Anonymous (verified owner)

    Works really & and excellent service

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  29. Anonymous (verified owner)

    Good quality and quick delivery

    (0) (0)
  30. Anonymous (verified owner)

    Progressive Earth is a great company. They are fast to ship, have great customer service and great products that are suitable for my sensitive EMS horse. I love the little chocolate bar you get in your package too! Thank you Progressive Earth 🙂

    (0) (0)
  31. Wendy (verified owner)

    Excellent quality. Even better service.

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  32. Kate B. (verified owner)

    My horse eats this MgO happily and needs less than the previous product I used, so it’s more cost effective as the same weight of product goes much further

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  33. Anonymous (verified owner)

    Good product, quick delivery

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  34. Anonymous (verified owner)

    Super company, very responsive, quick deliveries!

    (0) (0)
  35. Sam C. (verified owner)

    Excellent product – has transformed my spooky mare

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  36. Ella Livingstone (verified owner)

    Good price for high purity product. It is a VERY fine powder though so can be challenging to work with!

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  37. Zoe (verified owner)

    Excellent product ! It actually works much better than any other brand I’ve used over the past 20 years !

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  38. Anna (verified owner)

    Prompt efficient service and helpful knowledeable advice

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  39. Erika Alexander (verified owner)

    Very good product which comes in foil bags not plastic which helps the environment

    (0) (0)
  40. Penny R. (verified owner)

    Great product!!

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  41. Katherine Arthur (verified owner)

    High quality and purity at a low price!

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  42. Lydia (verified owner)

    Brilliant for adding magnesium alone to the diet. I did lots of comparison of magnesium supplements before going for this due to the superior composition. Great products from Pro Earth as always!

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  43. Maria (verified owner)

    Good quality, taste seems to be a bit of a problem but I guess that can’t be helped, so difficult to get the quantities in that I want, especially with ponies that haven’t got big feeds

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  44. Ian B. (verified owner)

    Excellent quality and packaged well for storage once opened.

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  45. Gillian (verified owner)

    palatable and horses have not been footy this year

    (1) (0)
  46. Kay Puddle (verified owner)

    Product as described. Fast delivery. Thank you

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  47. Victoria M. (verified owner)

    Great service and product

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  48. Anonymous (verified owner)

    Easy to order, quick delivery

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  49. Ian Harrison (verified owner)

    Good product and quick service

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  50. Kelly (verified owner)

    Excellent product excellent service

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  51. Katherine Arthur (verified owner)

    High purity magnesium at a great price.

    (1) (0)
  52. Hazel M. (verified owner)

    Like all their products great quality and good price.

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  53. BABS ROGERS (verified owner)


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  54. Adele Hughes-jones (verified owner)

    Perfect as always

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  55. Michael C. (verified owner)

    High quality product at a great price

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  56. Susanne Britton Hickson (verified owner)

    My barefoot, spooky Warmblood does very well on this, in addition to his Pro mineral mix. At 650kg I only add about half the recommended daily dose to boost the mineral mix. He’s sane and sensible on that and his feet are extremely strong. Well worth the money.

    (1) (0)

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937 reviews