If your pigs are getting a good variety of veggies, then the supplement is unneeded. While they really can't overdose on C, giving too much for a long period of time then suddenly decreasing it can cause pseudo scurvy.
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I've also heard that if i use boiled water it has no chlorine so the vitamin C will not degrade, would this be better?
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C will normally degrade as it's exposed to light and air so not sure how true this is.
If you are feeding things like bell peppers (capsicum) and other C enriched veggies such as kale once or twice a week and a broccoli floret once or twice a week, they don't need extra C unless they are ill or not eating.