While not specifically registered for livestock, it is commonly used off-label in sheep, cattle, and goats under veterinary guidance to support energy, appetite, and metabolic function
10.14336/AD.2021.0824 37 Djoumbou-FeunangY.FiamonciniJ.Gil-de-la-FuenteA.GreinerR.ManachC.WishartD
The oral bioavailability of NAC is low ( 600 mg/day) doses of NAC [37]
Your dog or cat makes it in the liver, but as they age or deal with disease, glutathione can be used up and produced in lower amounts

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The science behind this enthusiasm makes sense in theory