I agree that animals have a higher metabolism. Super high dosages of Vit C can cause kidney stones. Cats metabolize Vit C all by themselves, but it can be helpful in larger dosages for illness. The AAFCO doesn't recognize it as a necessary ingredient in pet foods as animals metabolize it on their own. And yes, I know we are talking about natural supplements and not food.

A regular dosage of Vit C for a healthy human is 100-200 mg a day. Yes, people can take higher dosages into the 1000's of mg's until bowel tolerance and then a human will no longer absorb it. So let's say you gave a 6 lb cat 200 mg per day. If 2350 mg = 2 teaspoons, to calculate a 200 mg dose of Vit C would = 1/6 of one teaspoon. If you give too much the cat will get diarrhea. Yes, potassium and magnesium are good for cats and dogs.

Ultimately the best thing would be to have a holistic veterinarian give the correct doses and frequencies for all the supplements.

I do hope the cat gets better soon.

CK