brewers yeast

Hi I have a horse that gets sweet itch Am interested in trying Brewers Yeast Can you tell me how much I should give her.
She is 16.3
Thanks
 
I buy it from holland and barret, extra strength and my shetland has 3 a day, gave him 5 a day for the first week to get it into his system. But he had a very very bad case of sweet itch when i first got him..he is still suffering now cos the midges just haven't been killed off yet round here.
mad.gif
 
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