Opti Mag 3 Magnesium Bolus


Opti-Mag 3 Boli are moulded metal cylinders containing 100g of magnesium in a weighted iron shot. It is indicated for use in adult cattle as an aid in the maintenance of magnesium intake during the high risk periods for magnesium deficiency at grazing.

2 in stock



Opti Mag 3 Boluses aid in the maintenance of magnesium intake.

Opti Mag 3 magnesium boli are moulded metal cylinders containing 100g of magnesium, weighted with iron shot.

For use during the high risk periods associated with grazing of rapid growing grass, by the provision of a slow release depot of magnesium.

Two boluses should be given to each animal 2-3 days before the expected risk period.

These should only be given to cattle over 300kg bodyweight

Active Substance
Each bolus delivers 3 mg of Magnesium daily.

Target Species
Cattle over 300 kg

Treats and Controls
Magnesium deficiency In fast growing grass

Application Method
Bolus gun

Withdrawal Period

2 bullets 2-3 days before turn out or period of risk. If necessary repeat no later than four weeks.


Only to be given to cattle of at least 300 kg bodyweight. Administer orally by using the specially designed bolus gun. Load the gun by inserting the bolus into the open end. Open the animal’s mouth and the gun should then be introduced carefully and gently until the bolus is in the region of the back of the tongue. Severe pressure on the tongue should be avoided. Depression of the plunger will deliver the bolus onto the rear part of the tongue, thereby initiating a swallowing action. The gun should then be carefully withdrawn from the mouth. A second bolus should then be administered following the same procedure.

Observe each animal for a short time after administration to ensure that the boli have not been regurgitated.

Key Features of the Opti-Mag 3:

  • Aid in magnesium intake.
  • Moulded metal cylinders
  • Contain 100g of magnesium
  • Weighted with iron shot.
  • For use during the high risk periods

For more information, check out this link

If you are interested in tis product, then you will also like this product

Shipping & Delivery

When you “submit” your order online, you will receive an Email Confirmation to acknowledge that the order has been received. We will endeavour to dispatch any orders received before 12 pm on the day the order is received (Mon-Friday) Excluding Bank Holidays, subject to payment and items being in stock. A standard shipping rate of €7.00 applies to all orders. Once the order is collected by the courier, shipping is normally 1-3 working days to Ireland. We have a large supply of stock in store but if there are any issues of stock we will contact you immediately. If for any reason you are not totally satisfied with your purchase, please contact Customer Service immediately. Some orders may take longer to process than others.

FORCE MAJEURE We shall have no liability whatsoever under, or in any way related to the sale and purchase of the Goods or otherwise for any failure to fulfil any obligation hereunder if and to the extent that such fulfilment is prevented by circumstances beyond our reasonable control.


We want you to be 100% satisfied with any purchase order placed with us. In the event that you experience difficulty with any of our products, we will be happy to help. Faulty goods will be replaced or credited in full within 28 days of purchase. It’s imperative that you contact us within 28 days as full refunds cannot be considered after this period. Please keep the original invoice and packaging. If you receive a product that has been damaged in transit or is faulty please contact us immediately so we can resolve the issue. Items must be unused and still have their original packaging and labelling attached.

Damaged or faulty goods will be credited in full including post and packaging. Damages and shortages must be notified within 7 days. Replacement and/or refunds are not available if the product is damaged or becomes faulty as a result of misuse, mishandling or the actions of any party other than Farm Direct or our employees.

If for any reason you are not satisfied with a product or service please contact us within seven days after receiving the delivery and we will deal with your query as quickly as possible.

Animal Health Remedies Licence to sell via the internet. Licence no. : INT/CE/053