FREE SHIPPING ON ORDERS OVER $99 (Exclusions Apply)
Mad Barn Magnesium Oxide Granules
Mad Barn’s magnesium oxide granules are a macromineral supplement that supports equine mood balance, performance, muscle function, and metabolic health. Magnesium plays many roles in the horse’s body. It is involved in the formation of bone and protein synthesis, helps to maintain electrolyte balance, influences nervous system regulation, and is a co-factor for a number of enzymes. This product is commonly used as an equine calming supplement. In one study, researchers in Australia fed 10 grams of added magnesium to horses (21 g total magnesium content in the diet) and observed a sedative-like calming effect that was comparable to a 0.04mg/kg bodyweight dosage of Acepromazine.
- Magnesium oxide supplement
- Supports equine mood balance
- Increases performance
- Improves muscle function
- Boosts metabolic health
Active Ingredients per 29 grams
Magnesium: 16 grams
Directions for Use
- Consult with nutritionist or veterinarian prior to use.
- Provide daily.
- Administer with feed.
Body Weight | Scoops | Dose |
< 440 lb | 1/2 scoop | 15 g |
440 – 1100 lb | 1 scoop | 29 g |
> 1100 lb | 1.5 scoops | 44 g |
1 scoop = 29.6 cc = 29 grams |
Annette G. 5/12/24 following an order from 3/16/24
This is not what Madbarn are now supplying - they now supply 56% Mag Oxide granules in a bag (the tub indicates it is full strength in powder form)
View conversationFree Shipping on Orders over $99
We offer FREE standard shipping on all orders over $99.00. Orders under $99 qualify for affordable $8.00 flat rate shipping. Overweight and oversize additional shipping charges may apply. See our Shipping Page for full details.
New England Next Day Shipping (including Saturday delivery!)
Live in New England and want your order delivered tomorrow? We offer affordable next-business day service by FedEx including delivery on Saturday for a flat rate of $11.99 for orders under $99, or just $2.99 for orders over $99. Overweight and oversize additional shipping charges may apply. See our Shipping Page for full details.
Additional Shipping Charges
Some of our items are heavy or oversized and may require additional shipping charges.
Overweight Items
Additional shipping charges for overweight items are calculated based on the total shipping weight of all overweight items. The amount charged is based the weight and shipping distance. See our Shipping Page for full details.
Oversize Items
Additional shipping charges for oversize items are calculated on a per product basis based on the chart below. To determine which zone your address is in, please refer to our Shipping Page for full details.
Oversize Product Class |
Zone A |
Zone B |
Zone C |
Oversize Group 1 |
$4.50 |
$6.50 |
$9.00 |
Oversize Group 2 |
$9.00 |
$11.00 |
$13.00 |
Oversize Group 3 |
$11.00 |
$15.50 |
$18.00 |
Oversize Group 4 |
$15.50 |
$18.00 |
$20.00 |
Oversize Group 5 |
$22.00 |
$27.50 |
$33.00 |
Oversize Group 6 |
$33.00 |
$38.50 |
$44.00 |
Oversize Group 7 |
$44.00 |
$55.00 |
$66.00 |