Activated Charcoal for Pets: Emergency Uses, Dosage & Benefits

Activated charcoal given with food

I am presently giving my Aussie activated charcoal with her food to absorb histamines so I don't have to give her drugs from the vet. This is working and helping to eliminate her itching. I prefer to give the charcoal in her food rather than her water bowl because she gets it in her rather than some separated charcoal in the bottom of her water bowl. However, does giving a dog the charcoal regularly (every day both meals) absorb the nutrients in the food or is this sustainable? Thank you.