Norbrook Opti Mag Bolus

£59.00 + VAT

Opti-MAG 3 Magnesium Bolus are moulded metal cylinders containing 100g of magnesium, weighted with iron shot.

Pack of 10

Bolus are indicated for use in adult cattle as an aid in the maintenance of magnesium intake during the high risk periods aasociated with the grazing of rapidly growing grass, by the provision of a slow release deposit of magnesium.


Bolus should be given to each animal two / three days before the expected period of risk, e.g. before tansfer from indoors to grass in the spring. If necessary repeat no later than four weeks.

– 1 bolus delivers 3g per day.

– 2 bolus delivery 6g per day.

Norbrook Opti Mag Bolus